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HD 179433



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The mass of X-ray Nova Scorpii1994 (=GRO J1655-40)
We have obtained high- and intermediate-resolution optical spectra ofthe black hole candidate Nova Scorpii 1994 in 1998 May/June, when thesource was in complete (X-ray) quiescence. We measure the radialvelocity curve of the secondary star and obtain a semi-amplitude ofK_2=215.5 +/- 2.4 km s^-1, which is 6 per cent lower than the onlypreviously determined value. This new value for K_2 thus reduces thebinary mass function to f(M) = 2.73 +/- 0.09 M_solar. Using only thehigh-resolution spectra, we constrain the rotational broadening of thesecondary star, v sin i, to lie in the range 82.9-94.9 km s^-1 (95 percent confidence) and thus constrain the binary mass ratio to lie in therange 0.337-0.436 (95 per cent confidence). We can also combine ourresults with published limits for the binary inclination to constrainthe mass of the compact object and secondary star to the ranges 5.5-7.9and 1.7-3.3 M_solar respectively (95 per cent confidence). Finally, wereport on the detection of the lithium resonance line at 6707.8 Å,with an equivalent width of 55 +/- 8 m Å.

Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1985A&AS...59...15A&db_key=AST

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Observation and Astrometry data

Constellation:Corona Australis
Right ascension:19h14m39.70s
Apparent magnitude:5.92
Distance:90.662 parsecs
Proper motion RA:48.1
Proper motion Dec:-39.3
B-T magnitude:7.04
V-T magnitude:6.009

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 179433
TYCHO-2 2000TYC 8375-2570-1
USNO-A2.0USNO-A2 0375-37418462
BSC 1991HR 7281
HIPHIP 94556

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