Distance and absolute magnitudes of the brightest stars in the dwarf galaxy Sextans A

Details Distance and absolute magnitudes of the brightest stars in the dwarf galaxy Sextans A Distance and absolute magnitudes of the brightest stars in the dwarf galaxy Sextans A

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..439s&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 439-456.

Astronomy and Astrophysics

Astrophysics

45

Cepheid Variables, Dwarf Galaxies, Red Giant Stars, Stellar Luminosity, Stellar Magnitude, Stellar Spectrophotometry, Calibrating, Hertzsprung-Russell Diagram, Light Curve, Star Distribution, Stellar Motions, Virgo Galactic Cluster

Scientific paper

In an attempt to improve present bright star calibration, data were gathered for the brightest red and blue stars and the Cepheids in the Im V dwarf galaxy, Sextans A. On the basis of a magnitude sequence measured to V and B values of about 22 and 23, respectively, the mean magnitudes of the three brightest blue stars are V=17.98 and B=17.88. The three brightest red supergiants have V=18.09 and B=20.14. The periods and magnitudes measured for five Cepheids yield an apparent blue distance modulus of 25.67 + or - 0.2, via the P-L relation, and the mean absolute magnitudes of V=-7.56 and B=-5.53 for the red supergiants provide additional calibration of the brightest red stars as distance indicators. If Sextans A were placed at the distance of the Virgo cluster, it would appear to have a surface brightness of 23.5 mag/sq arcec. This, together with the large angular diameter, would make such a galaxy easily discoverable in the Virgo cluster by means of ground-based surveys.

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