2019MNRAS.482.4592V

Query : 2019MNRAS.482.4592V

2019MNRAS.482.4592V - Mon. Not. R. Astron. Soc., 482, 4592-4605 (2019/February-1)

The orbital period-mass ratio relation of wide sdB+MS binaries and its application to the stability of RLOF.

VOS J., VUCKOVIC M., CHEN X., HAN Z., BOUDREAUX T., BARLOW B.N., OSTENSEN R. and NEMETH P.

Abstract (from CDS):

Wide binaries with hot subdwarf-B (sdB) primaries and main sequence companions are thought to form only through stable Roche-lobe overflow (RLOF) of the sdB progenitor near the tip of the red giant branch (RGB). We present the orbital parameters of 11 new long-period composite sdB binaries based on spectroscopic observations obtained with the UVES, FEROS, and CHIRON spectrographs. Using all wide sdB binaries with known orbital parameters, 23 systems, the observed period distribution is found to match very well with theoretical predictions. A second result is the strong correlation between the orbital period (P) and the mass ratio (q) in the observed wide sdB binaries. In the P-q plane two distinct groups emerge, with the main group (18 systems) showing a strong correlation of lower mass ratios at longer orbital periods. The second group comprises systems that are thought to be formed from higher mass progenitors. Based on theoretical models, a correlation between the initial mass ratio at the start of RLOF and core mass of the sdB progenitor is found, which defines a mass-ratio range at which RLOF is stable on the RGB.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: spectroscopic - stars: evolution - stars: fundamental parameters - subdwarfs

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PB 6355 HS* 01 16 27.3119638104 +06 03 11.610863712   13.27 13.04 13.04   sdB+F6V 10 0
2 SB 744 HS* 01 48 44.0374557768 -26 36 12.821580144   12.28 12.31     sdO7He1+F/G 53 0
3 FAUST 321 HS* 01 51 23.3904468816 -75 48 38.935891764   13.23 13.03 13.14   sdOB+F 9 0
4 JL 277 HS* 02 01 34.3581667680 -53 43 43.531744944   13.181 13.091 13.352   sdB+G 12 0
5 GALEX J022836.7-362543 HS* 02 28 36.8610032712 -36 25 45.686665920   13.63 13.54 13.72   sdB+K0 5 0
6 EC 03143-5945 HS* 03 15 30.0668968296 -59 34 04.938127608 12.79 13.477 13.376 13.542   sdB 12 0
7 GALEX J033216.7-023302 HS* 03 32 16.7365103928 -02 33 01.870280712   12.88   12.71   sdB+F0V 10 0
8 GALEX J053939.1-283329 HS* 05 39 39.2212782408 -28 33 30.585057156   13.86 13.89 14.15   sdO+G 9 0
9 BD+34 1543 HS* 07 10 07.7039318016 +34 24 53.808705504   10.29 10.17     sdB+F? 34 0
10 PG 1018-047 HS* 10 21 10.5841130328 -04 56 19.580115516   13.143 13.311     sdB2VIIHe0 30 0
11 EC 11031-1348 HS* 11 05 41.4157214688 -14 04 24.138495156   11.73 11.52     sdB+GV 15 0
12 PG 1104+243 HS* 11 07 26.2324234560 +24 03 11.108174724   11.49 11.39     sdOB+G2V 36 0
13 Feige 87 HS* 13 40 14.6950103088 +60 52 47.566392996   11.56 11.71     sdB+G4V 49 0
14 PG 1449+653 HS* 14 50 36.0746294472 +65 05 52.012309416   13.57 13.62 13.72   sdB+G5 30 0
15 Balloon 82800003 WD? 15 15 38.3465039784 +56 53 43.746923868   11.57 11.42 11.8   DA/sdB+K1? 16 0
16 EGGR 440 HS* 15 17 14.2689024744 +03 10 27.945158844 13.033 14.04 13.99 14.24 13.785 sdOB+G1V 35 0
17 GALEX J162842.0+111838 HS* 16 28 41.9881063536 +11 18 39.926162628   13.49 13.22 13.28   sdB+? 5 0
18 PG 1701+359 HS* 17 03 21.4582783560 +35 48 49.223998800   13.41       sdB1VIHe0 36 0
19 GALEX J173651.2+280635 HS* 17 36 51.1840844280 +28 06 34.640184672   11.69 11.40     sdB+GV 13 0
20 BD+29 3070 HS* 17 38 21.2004399672 +29 08 47.348080656   10.55 10.45     sdOB+F/G 35 0
21 CD-40 13747 HS* 20 15 04.7880723672 -40 05 44.110361148 11.91 12.09 11.82     sdO 53 0
22 PG 2148+095 HS* 21 51 16.8856102680 +09 46 59.453038236   13.04 13.04 13.25   sdB0.5VHe2 20 0
23 BD-07 5977 HB* 23 17 46.7880370560 -06 28 30.941880420   11.09 10.54     ~ 23 0

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