Volume 414, Number 2, February I 2004
|Page(s)||659 - 665|
|Section||Stellar structure and evolution|
|Published online||19 January 2004|
On the optical extinction and distance of GRS 1915+105
Service d'Astrophysique, DAPNIA, bâtiment 709, l'Orme des merisiers, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
2 Département de physique, bâtiment Buffon, Université de Versailles, 45 avenue des États-Unis, 78035 Versailles Cedex, France
3 Université Paris VII, 2 place Jussieu, 75251 Paris Cedex 05, France
Corresponding author: C. Chapuis, email@example.com
Accepted: 21 October 2003
Based on new millimeter and radio observations, we reevaluate the total hydrogen column density along the line of sight to the microquasar GRS 1915+105 to cm-2. Our value is consistent with the one derived from X-ray measurements, namely ( cm-2 (Ebisawa et al. [CITE]). Using the empirical law between the visual extinction and the total column density of hydrogen, Av is found to 19.6 ± 1.7 mag. This result is ~mag lower than previously thought, and therefore, a reevaluation of infrared fluxes after derredening is needed. The revisited kinematic study allows to give a lower limit to the distance of GRS 1915+105 , namely 6.0 kpc. Taking into account the most accurate upper limit of distance inferred from radio data ( kpc, Fender et al. [CITE]) as well as this lower limit, this implies a distance of kpc.
Key words: stars: individual: GRS 1915+105 / X-ray: binaries / ISM: extinction / molecular data
© ESO, 2004
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