C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST05:29:23

2004A&A...414L..13H - Astronomy and Astrophysics, volume 414, L13-16 (2004/2-1)

The rotational broadening and the mass of the donor star of GRS 1915+105.


Abstract (from CDS):

The binary parameters of the microquasar GRS 1915+105 have been determined by the detection of Doppler-shifted 12CO and 13CO lines in its K-band spectrum (Greiner et al., 2001Natur.414..522G). Here, we present further analysis of the same K-band VLT spectra and we derive a rotational broadening of the donor star of υsin i=26±3km/s from the 12CO/13CO lines. Assuming that the K-type star is tidally locked to the black hole and is filling its Roche-lobe surface, then the implied mass ratio is q=(Md)/(Mx)=0.058±0.033. This result, combined with (P,K,i)=(33.5d,140km/s,66°) gives a more refined mass estimate for the black hole, Mx=14.0±4.4M, than previously estimated, using an inclination of i=66°±2° (Fender et al., 1999MNRAS.304..865F) as derived from the orientation of the radio jets and a more accurate distance. The mass for the early K-type giant star is Md=0.81±0.53M, consistent with a more evolved stripped-giant donor star in GRS 1915+105 than, for example, the donor star of the prototype black-hole X-ray transient, V404 Cyg which has the longest binary period after GRS 1915+105.

Abstract Copyright:

Journal keyword(s): stars: infrared - stars: X-ray - black hole physics - stars: binaries - stars: individual: GRS 1915+105

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 - 2019
1 HD 138185 * 15 30 35.9803876692 -00 50 58.997696754   10.92 9.66     K1(IV) 6 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1666 1
3 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2233 0
4 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1051 0

    Equat.    Gal    SGal    Ecl

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