Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 09/14/2021 - 16:15

AAVSO Alert Notice 754 announces an observing campaign on 15 VY Scl-type CVs in support of HST Target of Opportunity observations. Please see the notice for targets, details, and observing instructions.

There are threads for this campaign under the following forums:

- Campaigns and Observing Reports: https://www.aavso.org/vy-scl-stars-too-campaign
- Cataclysmic Variables: https://www.aavso.org/vy-scl-stars-too-campaign-01
- Spectroscopy: https://www.aavso.org/vy-scl-stars-too-campaign-02

Please subscribe to these threads if you are participating in the campaign so you can be updated by the astronomers and by HQ. Join in the discussion or ask questions there!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Affiliation
Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) (VVS)
Uploaded first observations

I have uploaded the first observations of a part of the targets from the Southern hemisphere. Will continue as weather permits.

Josch

Dear All, 

A huge thanks in…

Dear All, 

A huge thanks in advance for your help with this campaign over the next three years!

Feel free to reach out to us at any moment, we are happy to answer any questions/doubts related to this project. We are also preparing a web page with detailed information on the HST program, I'll share it here once it's ready.

Good luck to you all with the observations :)

Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
New Upload

Finally clear weather to start on your campaign!! Here in northern Tasmania lot's of great daytime sky - but then the clouds roll in for night time, not good for optical!!

cheers, Merv

 

Affiliation
American Association of Variable Star Observers (AAVSO)
Priority list

A few days ago I sent some observations of V704 And, but bad weather avoid me from continuing.

I would like to know if the list of objects has been published according to their priority, that is, the most urgent at the top, and the low priority at the bottom.

Thank you in advance.

Mario (MMAO)

Priority list

Hi Mario,

The list has been ordered according to the targets' RA and there are only two classes of priorities (first and second). Within each class, targets have equal priority among each other. The only difference is that targets flagged as "first" have higher priority compared to those flagged as "second".

I hope this is helpful :)

Anna

 

Affiliation
American Association of Variable Star Observers (AAVSO)
V794 Aql

V794 Aql has been fading slowly and is now around 16.5. I gather it will be too late in the season now if this trend continues.

Regards,

Rod.

 

 

 

V794 Aql

Hi Rod, 

Thanks for pointing this out! 
I have been following the behaviour of this target over the last weeks and seems like it is oscillating between high and intermediate states. I will keep an eye on it in the hope that it will finally enter a stable low state during which the HST observations can be triggered.

Cheers,
Anna
 

Affiliation
American Association of Variable Star Observers (AAVSO)
Alert 754 - Schedule Impact due to HST Safe Mode ???

I read that Alert 758 for November, CH UMa has been cancelled due to the HST issue above.

Does the same apply to this campaign or are all observations to continue?

Gary

Affiliation
American Association of Variable Star Observers (AAVSO)
Alert 754 - Schedule Impact due to HST Safe Mode ???

I read that Alert 758 for November, CH UMa has been cancelled due to the HST issue above.

Does the same apply to this campaign or are all observations to continue?

Gary

VY Scl campaign continues as usual

Hi Gary,

The VY Scl campaign is not affected by the HST issue.

The reason for this is that the VY Scl observations will be executed as Target of Opportunity (ToO), i.e. they will be included in the HST schedule only when a low state is detected. For the moment, none of the VY Scl targets is expected to be observed by HST in the upcoming weeks. 

Therefore, it would be very helpful if the monitoring of the VY Scl targets could continue as usual since I expect that Hubble will be operative soon again, well before a ToO on one of the VY Scl targets is triggered.

Thanks,
Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
V704 And fading

I'm probably late to notice this, but I didn't find any other comments related to V704 And's current fade. The fade started around 12/13 (JD 59562) and the star is currently at V ~ 16, down 3 magnitudes from its normal state.

Shawn (DKS)

V704 And getting faint

Hi Shawn, 

Thanks for posting about this.

Indeed I have been keeping an eye on V704 And as it does look like it is entering a low state. We should wait few days to see if it stabilises on this faint state (and hence it is safe to trigger the HST observations) or if it oscillates as, for example, V794 Aql is doing.

I wish all the best for the new year to you and all the AAVSO observes!

Anna