2013A&A...550A...2M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:30:41

2013A&A...550A...2M - Astronomy and Astrophysics, volume 550A, 2-2 (2013/2-1)

HD 165246: an early-type binary with a low mass ratio.

MAYER P., HARMANEC P. and PAVLOVSKI K.

Abstract (from CDS):

Analyses of 13 FEROS spectra from the ESO archive and 617 V-band photometric observations from the ASAS3 database allowed us to demonstrate that HD 165246 is a double-lined spectroscopic binary. As an earlier finding revealed, HD 165246 is also an eclipsing system. We were able to derive consistent orbital and light-curve solutions and all basic physical properties of the system. The period of this O8V + B7V binary is 4.592706d and the semiamplitudes of the radial-velocity curves are K1=55.5km/s and K2=321km/s. As the mass ratio is small (0.173), the secondary lines cannot be seen directly in the spectra; however the application of spectral disentangling allowed us to detect weak Balmer and HeI lines of the secondary component. The primary component rotates with a high projected velocity of vsini=243km/s. A combined radial-velocity and light-curve solution led to the component masses and radii expected for the young stars of the given spectral types. Due to the high rotation velocity, the primary component might display changes in surface abundances of some elements. However, we did not find any significant differences with respect to the abundances of slowly rotating stars.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: eclipsing - stars: individual: HD 165246

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 - 2020
#notes
1 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1272 1
2 HD 53975 * 07 06 35.9656022838 -12 23 38.216531612 5.38 6.40 6.50 6.51   O7.5Vz 176 0
3 HD 164402 SB* 18 01 54.3808744917 -22 46 49.057918136 4.88 5.77 5.77 5.74 5.69 B0Iab/b 160 1
4 NAME Herschel 36 ** 18 03 40.321 -24 22 42.86 10.26 10.88 10.30 10.27   O7:V 176 2
5 * 9 Sgr Em* 18 03 52.4455370104 -24 21 38.639393923 5.08 5.97 5.97 5.72 5.70 O4V((f))z 516 0
6 HD 164816 Be* 18 03 56.8425960137 -24 18 45.119229391 6.17 7.06 6.986 8.08 6.989 O9.5V+B0V 136 0
7 HD 165052 SB* 18 05 10.5506202440 -24 23 54.850635234 6.16 6.98 6.87 7.77   O5.5:Vz+O8:V 248 1
8 Ass Sgr OB 1 As* 18 06 -22.8           ~ 113 0
9 HD 165246 ** 18 06 04.6786005245 -24 11 43.895418553 6.90 7.70 7.60 8.77   O8V(n) 68 0
10 * 11 Sgr Or* 18 09 17.7002679002 -23 59 18.232366605 6.65 7.45 7.31 8.36   O7V(n)z+B0:V: 125 2
11 * mu. Sgr s*b 18 13 45.8088401 -21 03 31.794073 3.60 4.07 3.85 3.58 3.38 B8Iab(e) 335 0
12 HD 199579 SB* 20 56 34.7781372461 +44 55 29.000769871 5.16 6.01 5.96     O6.5V((f))z 338 0
13 V* AR Cas Al* 23 30 01.9402842213 +58 32 56.100198639 4.18 4.760 4.886     B3V 197 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:30:41

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