C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET07:29:41

2006A&A...457.1043R - Astronomy and Astrophysics, volume 457, 1043-1046 (2006/10-3)

The secondary star and distance of the polar V1309 Orionis.


Abstract (from CDS):

The first phase-resolved JHK light curves of the eclipsing polar (AM Herculis binary) V1309 Ori are presented and interpreted. We separate the contributions from the secondary star and from other sources with the aim of determining a photometric distance. Simple model calculations show that the accretion stream and the cyclotron source on the accreting white dwarf are minor contributors to the infrared light, allowing an accurate determination of spectral type and absolute flux of the secondary star. The unilluminated backside of the secondary star as seen in eclipse has spectral type dM0 to dM0+. Its dereddened magnitude is K=13.58 at orbital phase φ=0 (eclipse). Using the calibrated surface brightness of M-stars and the published mass of the secondary, M2=0.46M, we obtain a distance d=600±25pc which scales as M21/2. The radius of the Roche-lobe filling secondary exceeds the main-sequence radius of an M0 star by 21+11–6%. The debated origin of the infrared light of V1309 Ori has been settled in favor of the secondary star as the main contributor and an accurate distance has been derived that will place estimates of the luminosity and synchronization time scale on a more secure basis.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: novae, cataclysmic variables - stars: distances - stars: late-type - stars: magnetic fields - stars: individual: V1309 Ori

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* V471 Tau EB* 03 50 24.9664598642 +17 14 47.433240686   10.258 9.373   8.393 K2V+DA 621 0
2 V* V1309 Ori AM* 05 15 41.4123841919 +01 04 40.479107028           M0.5 100 0
3 BD-06 1253 Ae* 05 36 25.4313245626 -06 42 57.684449700   11.65 10.9 10.29   A1e 408 1
4 V* YY Gem BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 826 0

    Equat.    Gal    SGal    Ecl

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