Special Notice #113: Request for observations of SDSS J212531.92-010745.9

July 18, 2008

Benjamin Beeck and Dr. Sonja Schuh (IfA, Goettingen) request time-series observations of the binary PG 1159-type variable star SDSS J212531.92-010745.9 (VSX J212531.9-010745, AUID 000-BCY-521) over the coming observing season.  The investigators request high photometric precision but with integration times below 600 seconds.  The system is faint and blue (V ~ 17.6; B-V = -0.4), and those with larger aperture telescopes are especially encouraged to participate.

Beeck and Schuh have requested the following observations, dependent upon the aperture available:

1) For telescopes below 0.5-m (20 inches), please observe in white light, with integration times as short as possible to obtain S/N of 100.  If you observe in white light, please supply the make and model of your CCD so that the PIs can determine the response function of your chip.

2) For telescopes 0.5-0.8-m (20-32 inches), please observe using a single filter, with bluer filters preferred if available.  Please keep exposure times below 240 seconds if possible.  If bluer filters require longer exposure times than 240s to reach S/N of 100, please observe in a higher-throughput filter instead.

3) For telescopes larger than 0.8m, please perform multicolor observations if multiple filters are available, with Rc, V, and B preferred.  Again, please keep exposure times below 240 seconds, and obtain S/N of at least 100.  

If you have computed transformation coefficients for your filters, please transform your data prior to submission.  If possible, please preserve your raw frames and flat fields so that they may be analyzed directly by the PIs.

Please report all observations to the AAVSO as "VSX J212531.9-010745" or with the AUID "000-BCY-521".

SDSS J212531.92-010745.9 is located at the following coordinates:

RA: 21 25 31.92 , Dec -01 07 45.9 (J2000)

Charts for this object may be plotted with VSP: http://www.aavso.org/observing/charts/vsp/index.html?pickname=VSX%20J212531.9-010745

This AAVSO Special Notice was prepared by Matthew Templeton.


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