American Association of Variable Star Observers (AAVSO)
Mon, 08/22/2011 - 21:13

We are gearing up to do photometry on some of the stars on the YSO list:

V682 Aql, V686 Aql, DU Cep, V357 Cep, C730 Cep, V353 Lac, and/or XX Sct.

These will be CCD observations using a C14 with an Apogee U47 and Optec BVRI filters.

Questions: as there is very little comp star data available, what do you suggest in terms of filters?  What filters have been used in the past to study these stars, and why?  Are there specific questions about these stars--individually--will be addressed?

For each imaging session, should we average a series of single-filter exposures?


Steve Smith, Robert Ferguson Observatory, Kenwood, California

URSA Astronomical Association, Variable Star Section (Finland) (URSA)
will participate to YSO program


Hi all,

Just to let you know that I will participate to this YSO/PMS program.

Was there somewhere a list of high priority targets or can we just pick any target from the program list?

-Mika Luostarinen

American Association of Variable Star Observers (AAVSO)

Hi, and thanks!

From your list I think V730 Cep is a good choice. Looks as though there's still a deal of activity in and around the circumstellar disc. However, I don't know how difficult observation will be due to the close proximity of an 8m star. The others have not been so intensively studied, but I seem to recall an article in a past Journal about XX Sct which was incorrectly catalogued as a Semi-Reg (I think - working from memory here!) so that's another possibility. I am on the point of submitting new sequences to VSP for stars in Per / Tau / Aur in that order. XY Per may also be a good one to go for; it's pretty bright, around 9-11mv.