The optical spectrum of GRO J0422+32 near quiescense.

Details The optical spectrum of GRO J0422+32 near quiescense. The optical spectrum of GRO J0422+32 near quiescense.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293l..69b&link_type=abstract

Astronomy and Astrophysics 293L, L69-L72 (1995)

Astronomy and Astrophysics

Astrophysics

10

X-Rays: Binaries, X-Rays: Novae, Accretion Disk, Black Holes, Stars: Individual Gro J0422432

Scientific paper

We report on spectroscopic observations of the X-ray nova GRO J0422+32 obtained on February 4th 1994 when the source has just returned to a quiescence phase after successive outbursts. Optical spectra recorded in the range (3500-10500A) when the source was at magnitude V~20.5, show features typical of the X-ray transients in quiescence. The Balmer lines are observed as strong very broad emission lines and the HeII(4686A) excitation line has disappeared. The Hα line shows a variable double-peak profile with a width suggesting a system inclined at i~50deg. The peak separation and velocity changes of the lines are used to constrain the compact star mass. Assuming a 5.1h orbital period, an upper limit of Mc=<2.2Msun_ is derived for the mass of the compact star. This is still therefore consistent with a neutron star and does not seem to confirm the suggestion that GRO J0422+32 may harbour a black hole.

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