2014A&A...572A.110L


Query : 2014A&A...572A.110L

2014A&A...572A.110L - Astronomy and Astrophysics, volume 572A, 110-110 (2014/12-1)

MY Camelopardalis, a very massive merger progenitor.

LORENZO J., NEGUERUELA I., VAL BAKER A.K.F., GARCIA M., SIMON-DIAZ S., PASTOR P. and MENDEZ MAJUELOS M.

Abstract (from CDS):

The early-type binary MY Cam belongs to the young open cluster Alicante 1, embedded in Cam OB3. MY Cam consists of two early-O type main-sequence stars and shows a photometric modulation suggesting an orbital period slightly above one day. We intend to confirm this orbital period and derive orbital and stellar parameters. Timing analysis of a very exhaustive (4607 points) light curve indicates a period of 1.1754514±0.0000015d. High-resolution spectra and the cross-correlation technique implemented in the todcor program were used to derive radial velocities and obtain the corresponding radial velocity curves for MY Cam. Modelling with the stellar atmosphere code fastwind was used to obtain stellar parameters and create templates for cross-correlation. Stellar and orbital parameters were derived using the Wilson-Devinney code, such that a complete solution to the binary system could be described. The determined masses of the primary and secondary stars in MY Cam are 37.7±1.6 and 31.6±1.4M, respectively. The corresponding temperatures, derived from the model atmosphere fit, are 42000 and 39000K, with the more massive component being hotter. Both stars are overfilling their Roche lobes, sharing a common envelope. MY Cam contains the most massive dwarf O-type stars found so far in an eclipsing binary. Both components are still on the main sequence, and probably not far from the zero-age main sequence. The system is a likely merger progenitor, owing to its very short period.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - binaries: eclipsing - stars: massive - stars: early-type

VizieR on-line data: <Available at CDS (J/A+A/572/A110): rphotmyc.dat>

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 TYC 3725-486-1 * 03 58 30.8310855432 +57 12 39.839027076   12.62 12.09     B9 4 0
2 TYC 3725-797-1 * 03 58 41.4529678080 +57 14 44.314624860   11.62 11.10     G0 3 0
3 LS I +57 137 * 03 58 46.5265803360 +57 10 43.488712200 12.619 11.4 11.2     B2p 14 0
4 Hilt 412 * 03 59 07.4899665432 +57 14 11.661837396 11.254 10.35 10.08     O8Vz 27 0
5 Cl Alicante 1 OpC 03 59 08 +57 14.4           ~ 13 0
6 BD+56 864 SB* 03 59 18.2933470368 +57 14 13.757279424 10.837 9.93 9.80     O5.5V(n)+O6.5V(n) 48 0
7 Ass Cam OB 3 As* 04 03 +56.7           ~ 25 0
8 UCAC2 1803231 * 05 37 39.2300701008 -69 09 51.026810616 15.220 16.099 15.806 16.07 15.118 O9:Vnnne+ 25 0
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1861 1
10 V* V838 Mon ** 07 04 04.8221494992 -03 50 50.648894412   15.5   15.18 14.51 M10+B3V 397 0
11 V* V662 Car EB* 10 45 36.3215655240 -59 48 23.261257368 12.74 12.91 12.05 12.10   O5Vz+B0:V 44 0
12 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1013 1
13 V* TU Mus EB* 11 31 10.9241479224 -65 44 32.099167788 7.58 9.52 9.34 9.25   O8V(n)z+B0V(n) 160 0
14 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 212 0
15 * 11 Sgr Or* 18 09 17.6999100192 -23 59 18.231196056 6.65 7.45 7.31 8.36   O7V(n)z+B0:V: 134 2
16 V* V1182 Aql SB* 18 55 23.1255094080 +09 20 48.087475944 8.73 9.10 8.64     O7V(n)((f))z+B 110 0
17 NAME Cyg Arm PoG 20 02 +40.0           ~ 155 0
18 V* V382 Cyg SB* 20 18 47.2202814912 +36 20 26.085111756 9.35 9.19 8.65     O6IVn+O5Vn 181 0
19 HD 215835 SB* 22 46 54.1107754872 +58 05 03.533752788 8.24 8.85 8.629   8.049 O5.5V((f))+O6V((f)) 245 0

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2022.07.01-06:30:47

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