IRAS observations of Delta Scuti variables - Implications for main-sequence mass loss and an IR period-luminosity relation

Details IRAS observations of Delta Scuti variables - Implications for main-sequence mass loss and an IR period-luminosity relation IRAS observations of Delta Scuti variables - Implications for main-sequence mass loss and an IR period-luminosity relation

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..658k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, June 1990, p. 658-668. Research supported by ARCS

Astronomy and Astrophysics

Astronomy

9

A Stars, Cepheid Variables, F Stars, Infrared Astronomy Satellite, Main Sequence Stars, Stellar Luminosity, Astronomical Catalogs, Color-Color Diagram, Stellar Mass, Stellar Oscillations, Stellar Rotation

Scientific paper

The far-infrared detections of Delta Scuti variables in The Bright Star Catalog by the IRAS satellite are investigated; 52 percent of the sample was detected at 12 microns. The 12 micron luminosity is correlated with L(Bol) and ranges from about 3 x 10 to the 31st to about 6 x 10 to the 32nd erg/s. Comparable numbers of Delta Sct variables and A-F nonvariables show infrared excesses in at least one IRAS passband. Further considerations show that contributions to these excesses due to mass loss are minimal. This investigation suggests that the pulsating variables are not losing mass at higher rates than nonvariable A and F stars which themselves do not appear to be losing mass at a rate above an expected level. The existence of a Period-12 micron luminosity relation of small dispersion, quite surprising in light of the uncertainties in these data is reported. It is demonstrated that such relations also exist at the J, H, and K bands. The possibility of using such relations for distance determinations is discussed in light of good distance estimates to three clusters using the P-L relation.

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