Distances and luminosities of irregular variables of type N

Details Distances and luminosities of irregular variables of type N Distances and luminosities of irregular variables of type N

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199..135p&link_type=abstract

Astrophysical Journal, vol. 199, July 1, 1975, pt. 1, p. 135-144.

Astronomy and Astrophysics

Astronomy

28

Infrared Astronomy, Interstellar Extinction, Irregular Variable Stars, Stellar Luminosity, Variable Stars, Distance, Near Infrared Radiation, Oort Cloud, Radial Velocity, Stellar Spectra, Ubv Spectra

Scientific paper

Near-IR photometric data obtained by Baumert (1972) are presented for a subgroup of 107 irregular and semirregular N variables, and it is suggested that variations in the (0.78-1.08)-micron color indices of these stars are primarily due to interstellar reddening. On this basis, the distances of 60 stars are estimated from color excesses in (B - V), and luminosities are derived from photometric data relative to Vega and the observed flux distribution to 14 microns from 19 Psc, which is taken as a prototype N irregular star. The estimated distances are shown to be supported by the Oort double-sine distribution of radial velocities, an apparent association with galactic spiral features, and agreement with previous bolometric corrections. A dispersion in bolometric magnitude is found in a Keenan-Morgan C subclass, with that parameter increasing from an average value of -4.4 in C4 stars to an average value of -5.6 in C7 stars. Near-IR CN bands are found not to correlate with luminosity, while the Merrill-Sanford bands are found to be negative luminosity indicators.

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