V919 Sgr in outburst

V919 Sgr in outburst

Postby Francois Teyssier » Tue Aug 02, 2022 6:48 am

https://www.astronomerstelegram.org/?read=15528

AAVSO light curve :
v919sgr.png
v919sgr.png (12.14 KiB) Viewed 1259 times
Last edited by Francois Teyssier on Wed Aug 03, 2022 5:10 pm, edited 1 time in total.
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Tue Aug 02, 2022 10:32 am

Hello,

Last night I observed V919 Sgr, in bad transparency conditions and unfortunately the
clouds interrupted me on the middle observation, because my intention was to take 6 integrations in total.

But I think the result is reasonably good, so I'm going to try it again tonight.

Regards, Joan Guarro.
Attachments
V919 SGR_1.png
V919 SGR_1.png (14 KiB) Viewed 1327 times
V919 SGR_2.png
V919 SGR_2.png (23.34 KiB) Viewed 1327 times
V919 SGR_3.png
V919 SGR_3.png (11.68 KiB) Viewed 1327 times
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Wed Aug 03, 2022 10:43 am

Hello, 

That is V919 Sgr yesterday night, the observation was taken through a SC16 telescope,a NOU_T echelle and an ASI2600MM, with a 5 integrations of 1200.

I'm really glad with the NOU_T,  ( the Tim Lester echelle design ),  and its equipment results.

The most curious is the chromospheric H&K activity and the quantity of absorption lines in the blue.

Cheers, Joan.
Attachments
V919 SGR_4.png
V919 SGR_4.png (13.06 KiB) Viewed 1282 times
V919 SGR_5.png
V919 SGR_5.png (33.56 KiB) Viewed 1282 times
V919 SGR_6.png
V919 SGR_6.png (16.49 KiB) Viewed 1282 times
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Re: V919 Sgr in outburst

Postby Francois Teyssier » Wed Aug 03, 2022 5:08 pm

A great spectrum at Mag V ~ 10.6!

The outburst is produced by an increase of the luminosity of the hot component (envelope of the white dwarf and/or accretion disk). The mechanism is not well known.
At this state, it appears as a A-F giant/super-giant (to be precised by a detailed study of the absorption lines) which overwhelm the continuum of the cool component and its TiO bands.

See also the last spectra of BX Mon last spring.


All the best,
François
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Re: V919 Sgr in outburst

Postby 2SPOT » Thu Aug 04, 2022 6:40 am

Spectrum taken the 2sd august in Chile

Image

Automatic observation and process with our ARP pipeline (no human intervention).
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
Suport our action : https://www.helloasso.com/associations/2spot/formulaires/2
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Thu Aug 04, 2022 2:44 pm

Hello,

Another good result with the NOU_T echelle equipment, this is V919 Sgr yesterday night.

Cheers, Joan Guarro.
Attachments
V919 SGR_7.png
V919 SGR_7.png (13.5 KiB) Viewed 1208 times
V919 SGR_8.png
V919 SGR_8.png (33.98 KiB) Viewed 1208 times
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Fri Aug 05, 2022 9:11 am

Hello,

Another NOU_T echelle observation.

V919 Sgr seems to keep its graphic without significant variations.

Cheers, Joan Guarro.
Attachments
V919 SGR_9.png
V919 SGR_9.png (15.98 KiB) Viewed 1173 times
V919 SGR_10.png
V919 SGR_10.png (19.79 KiB) Viewed 1173 times
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Tue Aug 09, 2022 10:38 am

Hello,

You can see here that V919 Sgr is runningo its course, this is a graphic from yesterday night of NOU_T echelle equipment from Piera.

Cheers, Joan Guarro.
Attachments
V919 SGR_11.png
V919 SGR_11.png (18.03 KiB) Viewed 1079 times
V919 SGR_12.png
V919 SGR_12.png (13.86 KiB) Viewed 1079 times
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Fri Aug 12, 2022 8:45 pm

Hello,

This is the ninth very nice V919 Sgr spectrum through a NOU_T echelle.

The aim now is to complement all these R=9000 longer range spectra with fine photometry. This is the challenge that modern astrophysics demands.

Cheers, Joan Guarro.
Attachments
V919 Sgr 210220811.png
V919 Sgr 210220811.png (20.03 KiB) Viewed 971 times
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Re: V919 Sgr in outburst

Postby Joan Guarro Flo » Mon Aug 15, 2022 8:21 am

Hello,


You can see in this 11th observation of V919 Sgr, with the NOU_T echelles from Piera and Santa Maria M. Observatories, that the star keeps its shape
with only some variations in the hidrogen.

Cheers, Joan Guarro.
Attachments
V919sge20220814.png
V919sge20220814.png (17.59 KiB) Viewed 878 times
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