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Information letter Supp n° 2 15-03-2015
- Compilation of Steve Shore's notes for ARAS group in 2013 & 2014
The information letter is now indexed in NASA/ADS. See e.g. http://adsabs.harvard.edu/abs/2019ESIL...40L...4T
____ 2022 _________________________________________________________________________________
Information letter n°50 - 2022-01 15-05-2023
Observations of novae and symbiotic stars during the first semester of 2022.
Steve Shore: Transcients band Spectroscopy Analysis: The intermediate luminosity optical transcients (ILOT) & stellar mergers
Paolo Berardi: An emission line from Earth's atmosphere
Tim Lester: PlotSpectra: a data visualization utility for amateur astronomical spectroscopy.
____ 2021 _________________________________________________________________________________
Information letter n° 49 - 2021-01a 15-08-2020 (supplement)
Recurrent Symbiotic Nova RS Oph in outburst (August 2021)
What to expect and why:
RS Oph and Symbiotic-like recurrent novae
by Steve Shore
____ 2020 _________________________________________________________________________________
Information letter n° 47 - 2020-03 15-08-2020 (8 Mo)
Novae
Two novae observed during 2020-Q3:
Nova Sgr 2020c and Nova Cas 2020
Symbiotics
CM Aql and V1413 in outburst
AX Per, CI Cygni: eclipse
Classification of Symbiotic Stars
Notes
Time series II Steve Shore
Scientific publication and contributions Steve Shore
Information letter n° 46 - 2020-02 15-08-2020 (4 Mo)
Novae
V1369 Cen (Nova Cen 2013) and V659 Sct in nebular phaseSymbiotics
High cadency monitoring of the symbiotic recurrent novae T CrB and RS Oph
First spectrum of SY Mus in the database
Notes
Steve Shore: Time series
Information letter n° 45 - 2020-01 27-06-2020 (4 Mo)
Symbiotics
AG Dra: flux calibration
AX Per: declining outburst
V694 Mon: high cadency monitoring during 2020-Q1
UVEX: symbiotic stars in the near UV
Cataclysmic stars
New outburst of the Dwarf Nova TCP J21040470+4631129
Miscellanous
Two Spring Comets - David Boyd
Notes
Steve Shore:
How to impersonate a nova
Publication using ARAS database in 2019
____ 2019 _________________________________________________________________________________
Information letter n° 44 - 2019-04 08-12-2019 (4 Mo)
Novae
2 classical nova events were observed during 2019-Q4: Nova LMC 2019 and nova Sct 2019 (V659 Sct)
One spectrum of nova Cyg 2019 (PGIR 19brv) in the near-IR was acquiredSymbiotics
182 spectra of symbiotic stars were acquired during 2019-Q4 by 16 observers at resolution from 500 to 15000. The monitoring of the prototypical AX Per continued; at the end of 2019, [Fe VII] is still absent. CH Cygni continue to oscillate at low luminosity. R Aqr was continuously observed during the decline of the pulsation of its Mira component at a faint luminsosity suggesting an eclipse. V694 Mon still at high luminosity and low velocity of the absorptions in Balmer and Fe II (42) lines were observed in support to HST observations. FASTT 1100, showing [OIII] l 5007, was detected as a new symbiotic star.
Dwarf nova
The very bright transient TCP J21040470+4631129 was detected by Hideo Nishimura on 2019-07-12.190 UT. As reported in the 2019-Q3 newsletter, it was identified as a dwarf nova outburst by F. Teyssier with an Echelle spectrum obtained on 2019-07-12.190 UT (ATel 12936,) and confirmed by Tim Lester in another Echelle spectrum obtained a few hours later.
Over a 6 month period from July to December 2019, the dwarf nova experienced one bright superoutburst followed by two short rebrightenings, a second full but less bright outburst followed by another short rebrightening and then, 3 months later a third full outburst. This behaviour is most unusual for a suspected WZ Sge-type dwarf nova.
A campaign to observe this object by amateurs and professionals using both photometry and spectroscopy was coordinated by Dr Vitaly Neustroev. Analysis of these observations will be published in due course. Further information was published in ATels 12947, 13009, 13122 and 13297.Some notes on shocks and diagnostics (2)
Steve Shore
Information letter n° 43 - 2019-03 08-12-2019 (6 Mo)
Novae
2 classical nova events were observed during 2019-Q3: Nova SMC 2019 and nova Ori 2019
One spectrum of nova Sgr2015b in nebular phase, 4 years after its outburst.
The recurrent symbiotic nova V3890 Sgr were observed along its third recorded outburst. 61 spectra were
obtained from the peak of the outburst to magnitude 15.Symbiotics
178 spectra of 23 symbiotics stars were obtained during 2019-Q2. After a series of 4 outbursts (2015-2018), no outburst detected for AG Dra in 2019. AX Per was monitored during the decline of its outburst. V694 Mon (MWC 560) remains at high luminosity. The terminal velocities of Balmer and Fe II lines are low (~ 500 km.s-1). The luminosity of CH Cyg oscillates by ~ 1 mag at ~ 80 days time scale, with significant changes of the relative intensity and profiles in all lines. The high cadency monitoring of this target allows to detect an abrupt change between 2019-05-12 and 14 in just 2 days during a rise.Dwarf nova
The very bright transient TCP J21040470+4631129 was detected by Hideo Nishimura on 2019-07-12.190 UT. It has been identified as a dwarf nova outburst by F. Teyssier with an Echelle spectrum obtained on 2019-07-12.190 UT (ATel#12936) and confirmed by Tim Lester in another Echelle spectrum obtained a few hours after. From time-series spectra obtained at a resolution R =1000 to 6000, Neustroev+ (ATel#13009) deduced an orbital period of 77.07 +/- 0.2 mn consistent with superhump period deduced from photometry (78.9 +/- 0.4 mn). The behavior is very atypical. The lightcurve shows dips, short rebrightnings (onJD 2458704, 8710, 8742) and a secondary superoutburst of a duration of 9 days from JD 2458721 to 8729.
49 spectra (including 6 time-series) were obtained from 12-07 to 25-09-2019.Flux calibrating spectra in the ARAS database
David BoydSome notes on shocks and diagnostics
Steve Shorehttps://ui.adsabs.harvard.edu/abs/2019ESIL...43...19T/abstract
https://ui.adsabs.harvard.edu/abs/2019ESIL...43....2T/abstract
Information letter n° 42 - 2019-02 06-10-2019 (5 Mo)
Symbiotics
178 spectra of 23 symbiotics stars were obtained during 2019-Q2. After a series of 4 outbursts (2015-2018), no outburst detected for AG Dra in 2019. AX Per was monitored during the decline of its outburst. V694 Mon (MWC 560) remains at high luminosity. The terminal velocities of Balmer and Fe II lines are low (~ 500 km.s-1). The luminosity of CH Cyg oscillates by ~ 1 mag at ~ 80 days time scale, with significant changes of the relative intensity and profiles in all lines. The high cadency monitoring of this target allows to detect an abrupt change between 2019-05-12 and 14 in just 2 days during a rise.RS Oph monitoring before the next nova-type outburst
Augustin Skopal & Natalia Shagatovahttps://ui.adsabs.harvard.edu/abs/2019ESIL...42....2T/abstract
Information letter n° 42 - 2019-02 supp1 11-08-2019
RS Oph monitoring before the next nova-type outburst
Augustin Skopal & Natalia Shagatova
Information letter n° 41 - 2019-01 18-05-2019 (7 Mo)
Symbiotics
198 spectra of 23 symbiotic stars at resolution from 500 to 15000 were obtained during 2019-Q1 by 18 observers.
AG Dra is monitored before the expected outburst in 2019. At the date (2019-05-18) no sign of outburst has been detected. AX Per soon after the oulet of its eclipse has been detected in strong classical outburst, characterized by the weakening of high emission lines [Fe VII]. CH Cyg is in low luminosity, several spectra has been obtained during a short flare. V694 Mon, in high luminosity, has been monitored at high cadency during the season. The profiles of Balmer and Fe II lines is unusual with a classical P Cygni profile and the disappearence of the broad blue absorption lines.
Mysterious 5018 line in the spectrum of AG Dra in outburst
François TeyssierTCP J05390410+4748030 Dwarf nova in outburst
Paolo Berardi, Lorenzo FrancoNew Online Database of Symbiotic Variables
Jaroslav Merc, Rudolf Gális, Marek WolfSpin, angular momentum,
and how they govern your spectra
Steve Shore
____ 2018 _________________________________________________________________________________
Information letter n° 40 - 2018-04 24-11-2018 (5 Mo)
Novae
A new spectrum of nova Sct 2017 in nebular phase obtained by James Foster
Symbiotics
202 spectra of 26 symbiotic stars at resolution from 500 to 15000 were obtained during 2018-Q4.
AG Dra has recovered its quiescent state after April 2018 outburst. CH Cyg has been monitoting at a high cadency during its monotically decline from mag V = 6.4 early august to V = 8.5. More than 700 spectra of CH Cygni are now gathered in the database. First spectrum of the poorly studied EF Aql in the database. Spectra of the new symbiotic Hen 3-1768 detected within the context of the program "suspected symbiotic stars" show strong He II l 4686 and Raman OVI 6830. The new symbiotic star HbHa 1704-058 observed during its decline show increasing raman OVI band (EW = -3.3) while [OIII] and [Fe VII] remain very weak if present. V694 Mon, at high luminosity (V ~ 9) , presents unusual shape of Balmer and Fe II lines: the common broad absortion is replaced by P Cygni profiles at much lower velocities (maximum of absorption ~ -100 km s -1). The protypical Z And returns to quiescent state after the outburst which occured in January 2018.
The music of the spheres
Steve Shorehttps://ui.adsabs.harvard.edu/abs/2019ESIL...40L...4T/abstract
Information letter n° 2018-03 24-11-2018 (9 Mo)
Novae
We present spectroscopic observations (R = 500 to 15000) of 4 novae during 2018, 3rd quarter.
Nova Sct 2017: in nebular phase, shows quick and strong changes at a short time scale, noticely high excitation lines such as He II or [Fe VII].
Nova Lup 2018: discovered on June, 3rd
Nova Sct 2018: discovered on June, 29th was identified as a nova by Umberto Sollecchia and Olivier Garde on June, 30 th (ATel#11802). The spectroscopic development is described using ATels#11802, 11826, 11859 written by Steve Shore for ARAS group.
Nova Oph 2018c: By means of high cadency monitoriring, the helium flash is precisely dated (2018-08-29) and an unexpected weakening of helium lines is detecyed on 2018-09-08Spectroscopy with Omicron 1 m telescop in southern France
Olivier Garde, Pascal Le Du, Bertrand GueganMiscellanous notes: MWC 560, Recurrents, Narrow lines in novae
Steve ShoreConference Small Telescopes - Tatranskà Lomnica (Slovakia)
F. Teyssier
Information letter n° 2018-02 12-08-2018
Jaroslav Merc & Rudolf Gàlis:
The fourth hot outburst of AG Draconis during present active stage
Steve Shore:
More on thermometers and photospheres
A tale of two transitions: Ca II and O I
Uwe Zurmül:
Transmission grating in convergent beam
Information letter n° 2018-01 30-04-2018
Steve Shore :
Physical temperatures and fluxes of the ionizing sources
in symbiotics, novae, ...
____ 2017 _________________________________________________________________________________
Information letter n° 2017-08
Information letter n° 2017-08 30-11-2017
Steve Shore:
The gorilla in the room: magnetic fields
Information letter n° 2017-08 Sup. 3 XX-12-2017
CH Cygni in 2017
Information letter n° 2017-07 30-11-2017
Paolo Berardi:
Some long-slit observations of the symbiotic star R Aquarii
Steve Shore:
Analytical methods: a tutorial on stellar atmospheresInformation letter n° 2017-07 Sup. 2 22-10-2017
R Aqr CampaignInformation letter n° 2017-07 Sup. 1 07-10-2017
R Aqr Campaign
Information letter n° 2017-06 01-08-2017
Augustin Skopal:
On the stellar wind from hot components in symbiotic binaries
Steve Shore:
Nova Sct 2017
IRAS 17449+2320 and other misdemeanors
Supernova spectra
Information letter n° 2017-05 29-06-2017
AG Dra Campaign, Rudolf Gàlis
Steve Shore:
Novae: the effects of dust formation on line profiles
Absorption line fine points: the Balmer decrement and the terminal absorption velocityInformation letter n° 2017-04 06-05-2017
AG Dra Campaign, Rudolf Gàlis
Call for Spectroscopic monitoring of V694 Mon, Adrian Lucy & Jeno Sokolovski
Steve Shore:
Common envelope, mergers, and booms
Information letter n° 2017-03 10-04-2017
AG Dra campaign Rudolf Gális, Jaroslav Merc & Laurits Leedjärv
Steve Shore:
Ejecta, Winds and Jets
Information letter n° 2017-02 05-03-2017
Steve Shore:
Molecules in your spectra
Some new targets: the B[e] stars, an introductionInformation letter n° 2017-01 31-01-2017
Steve Shore:
Some fluid notions and motions
Some comments about CH Cyg and SU Lyn____ 2016 _________________________________________________________________________________
Information letter n° 2016-09 08-01-2017
Information letter n° 2016-08 12-12-2016
Disks, Steve Shore
Filckering or not flickering? F. TeyssierInformation letter n° 2016-07 15-10-2016
Steve's notes:
Nova Lup 2016
Late stages of novae: some new results
Inferring structure from symbiotic star line profiles
Analytical techniques: Equivalent widths for absorption and emissionInformation letter n° 2016-06 18-09-2016
David Boyd : Phase dependence of emission line flux in the spectrum of V1329 Cyg
Peter Somogyi : Observations of V Sagittae
Steve Shore : Binary stars, atmospheric eclipses, absorption line studies, and the ζ Aur stars
Steve Shore :V SgeInformation letter n° 2016-05 15-07-2016
Analysis Techniques Steve Shore
A note on stellar winds in symbiotic binaries Augustin Skopal
Information letter n° 2016-04 16-05-2016
SU Lyn, new symbiotic star
Information letter n° 2016-03 19-04-2016
Jets and collimated flows, Steve Shore
AX Per in ouburst
T CrB : superactive state
Information letter n° 2016-02 20-03-2016
Interactions of flows and environment, Steve Shore
V694 Mon high state, AX Per outburst, T CrB "supeactive state"Information letter n° 2016-01 21-02-2016
On quiescent and active phases of symbiotic stars: A first glance to the AG Peg outburst, Augustin Skopal
When winds collide, Steve Shore
____ 2015 _________________________________________________________________________________
Information letter n° 2015-10 15-01-2016
A small tutorial on spectral types, colors, and effective temperatures, Steve Shore : secondary
AG Peg : secondary outburst in 2015 (F. Teyssier)
CI Cyg : long term monitoring (F. Teyssier, J. Guarro, D. Boyd)
V404 Cyg : second outburst in 2015 (P. Somogyi)
Information letter n° 2015-09 20-12-2015
On symbiotics, novae, and active galaxies: Spectra and structure, another way to think about connections, Steve Shore
Information letter n° 2015-08 01-11-2015
Comments about Novae and Symbiotics observations in October, Steve Shore
Information letter n° 2015-07 09-10-2015
The current CH Cygni active phase Emergence of unforseen hydrogen line profiles by Augustin Skopal
Absorption lines, abundances, and atmospheresby Steve Shore
The ARAS spectroscopic data base by François Teyssier, Christian Buil, Olivier ThizyInformation letter n° 2015-06 06-09-2015
- Eclipsing systems as probes of atmospheric structure by Steve ShoreInformation letter n° 2015-05 19-07-2015
- Nova Sgr 2015 No. 2 forms dust: the event and the physics by Steve Shore
-A photo-ionized nebula observed around the dwarf nova PNV J03093063+2638031 by Paolo BerardiInformation letter n° 2015-04 31-04-2015
- A note on applicability of low-resolution spectra of CH Cyg by Augustin Skopal
- Some comments on the currents beasts (Nova Sgr 2015B, Nova Sco 2015, …) by Steve Shore
- Now back to the discussions of winds and lines by Steve Shore
Information letter n° 2015-03 31-03-2015
- A comment on the recent evolution in the line spectrum of CH Cygni by Dr Augustin Skopal
- The events during the optically thick stage by Dr Steve Shore
- Spectroscopy of comet C/2014 Q2 (Lovejoy) by Paolo Berardi
Information letter n° 2015-02 28-02-2015
- More on Plasma Diagnostics and Line Formation ‐ ionization freeze‐out in more detail (Dr Steve Shore)
- Spectroscopy of planetary nebulae ‐ 150 years later... Olivier Thizy, François TeyssierInformation letter n° 2015-01 31-01-2015
- Introduction to CH Cygni campaign (Augustin Skopal)
- MWC 560 = V694 Mon = ? (Steve Shore)____ 2014 _________________________________________________________________________________
Information letter n° 2014-012 31-12-2014
- Ungoing observations of Nova Del 2013 and Nova Cyg 2014
- CH Cygni campaign (Dr Augustin Skopal) : first results
- Balmer line formation and variations in Symbiotic Stars
and a comment on abundance determinations (Steve Shore)Information letter n° 2014-011 30-11-2014
- Ungoing observations of Nova Del 2013 and Nova Cyg 2014
- CH Cygni campaign (Dr Augustin Skopal)
- SS443 : SS 433 = V1343 Aql: The prototypical Galactic jet source (Steve Shore)Information letter n° 2014-010 11-10-2014
Comments about Nova Cyg 2014 in nebular phase by Steve Shore
Information letter n° 2014-009 07-09-2014
More on spectra and line formation Application to symbiotic stars and composite spectra By Steve ShoreInformation letter n° 2014-008 11-08-2014
with notes from Steve Shore New notes on spectra and line formation, on the regularities of line spectra
and the regularities of atomic structure - Isoelectronic sequencesInformation letter n° 2014-007 06-07-2014
with notes from Steve Shore about symbiotic stars and accretion phenomena in binary systems (4) and Nova Cyg 2014Information letter n° 2014-006 31-05-2014
with notes from Steve Shore about symbiotic stars and accretion phenomena in binary systems (3) and Raman ScatteringInformation letter n° 2014-005 28-04-2014 with notes from Steve Shore about symbiotic stars and accretion phenomena in binary systems (2)
Information letter n° 2014-004 14-04-2014 with notes from Steve Shore about symbiotic stars and accretion phenomena in binary systems (1)
Information letter n° 2014-003 30-03-2014 with notes from Steve Shore about Nova Del 2013, Nova Cen 2013 and Nova Sco 745
Information letter n° 2014-002 16-03-2014
Information letter n° 2014-001 07-03-2014
For futher informations, email francoismathieu.teyssier [at] bbox.fr