2001A&A...370..507Y


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET02:29:43

2001A&A...370..507Y - Astronomy and Astrophysics, volume 370, 507-512 (2001/5-1)

UY Ursae Majoris: A W-subtype W UMa system with a small mass ratio.

YANG Y., LIU Q. and LEUNG K.-C.

Abstract (from CDS):

We present light curves and photometric solutions of the contact binary UY UMa in this paper. The light curves appear to exhibit a typical O'Connell effect, with Maximum I being 0.034mag(V) and 0.030mag(B) brighter than Maximum II, respectively, and Maximum I shifting to phase 0.26. The light curves are analyzed by means of the latest version of the WD program. The results show that UY UMa is a W-subtype contact binary with a small mass ratio q=0.134. The asymmetry of the light curves is explained by star spot models. From the collected data of 9 UMa contact systems with a smaller mass ratio than 0.20, the nature of the secondaries is analyzed. The results show that the luminosities and densities of the secondaries could be controlled by the primaries and that the smaller the mass ratio, the stronger the control.

Abstract Copyright:

Journal keyword(s): stars: binaries - starspots - stars: variables: general

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 23161 * 03 42 46.5699044984 -02 21 38.664035825   9.780 9.36     F2V 12 0
2 V* V624 Tau dS* 03 43 43.2418015652 +24 22 28.449807684   8.49 8.22     A7V 117 0
3 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G0V 118 1
4 HD 23731 * 03 48 18.9368892825 +26 35 21.016011591   9.13 7.98     K2 10 0
5 V* FG Hya EB* 08 27 03.9413981176 +03 30 52.329514882   10.62 10.04   9.401 G0 175 0
6 V* AW UMa WU* 11 30 04.3159101276 +29 57 52.677255375   7.27   6.7   F0 272 1
7 V* TV Mus WU* 11 39 57.7650431238 -64 48 59.218089690   11.48 10.75   9.712 F2 64 0
8 V* UY UMa EB* 13 44 36.8378261432 +55 13 18.355910107     12.90     ~ 35 0
9 V* XY Boo EB* 13 49 11.5668982802 +20 11 24.591106089   10.71 10.54     F5V 138 0
10 V* RR Cen EB* 14 16 57.2205732062 -57 51 15.655885175 7.70 7.65 7.29     A9/F0V 138 0
11 V* V677 Cen EB* 14 42 34.6428635653 -40 27 16.018950525   11.47 10.85   10.00 ~ 26 0
12 * eps CrA EB* 18 58 43.3840785329 -37 06 26.377252402   5.19 4.83     F4VFe-0.8+ 195 0
13 V* MW Pav EB* 20 46 27.7482468407 -71 56 58.465629949   9.15 8.79     F3IV/V 63 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-02:29:43

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