Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714406c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #144.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present a photometric study of detached Algol system, V1001 Cas [RA(J2000) = 23h 50m 17.12 s, Dec(J2000)= +51° 11' 29", MisV1222, GSC 3651-00655, USNO-A2.0 1350.18742581] with 0.43 days period. It was discovered 2005 and reported in IBVS 5600 (Nakajima, Yoshida, and Ohkura 2005). Their report characterizes it as EB system. Its short period, similar to W UMa's and its distinct EA light curve (large eclipse depths difference, shallow amplitude secondary, long stretches of low variation outside eclipses) make it rare and interesting for photometric investigation. Our images were taken 26,27, September, 2009, at Lowell Observatory (NURO) and 28 September 2009 via remote observing from Kitt Peak with SARA. UBVRI CCD photometry shows V1001 Cas has a V=1.2 mag primary eclipse and a 0.1 mag secondary amplitude. Our period study yielded 5 times of minimum light. These include JD Hel Min I = 2455100.8306 ± 0.0036, 2455101.6888 ± 0.0002, 2455103.83367 ± 0.00028 , JD Hel Min II = 2455100.6160 ± 0.0005, 2455103.61961 ± 0.0005.
Using CCD minima, we calculated the first precision ephemeris,
HJD Min I = 2455101.6890 ± 0.0008 + 0. 4287188 ±0.0000002d*E.
We first manually fit BVRI Johnson-Cousin's Photometry with Binary Maker. This revealed V1001 Cas is a well detached binary with spot activity. Next, we performed BVRI simultaneous WD synthetic light curve analysis. With its deeper secondary, the I curve, although of good quality, would not fit with the others. So, we did a BVR solution. Our first solution gives a mass ratio of nearly 1.0, a temperature difference of 850 K, with fill-outs of 71% and 78% of the primary and secondary stars’ respective lobes. We only needed one 22o radius cool spot with a temperature of 0.72 times that of the photosphere. The stars appear to be of mid K and early M main sequence-type.
Chamberlain Heather
Faulkner Danny
Samec Ronald G.
Vanhamme Walter
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