Long-period oxygen-rich optical Miras in the solar neighborhood

Details Long-period oxygen-rich optical Miras in the solar neighborhood Long-period oxygen-rich optical Miras in the solar neighborhood

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..298j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 298-303.

Astronomy and Astrophysics

Astrophysics

29

Infrared Stars, Oxygen, Solar Neighborhood, Stellar Mass Ejection, Variable Stars, Long Term Effects, Stellar Evolution

Scientific paper

The spatial distribution of the oxygen-rich Miras with periods longer than 400 days in the neighborhood of the sun were determined using available survey and the K-band period luminosity relationship. It is found that the exponential scale height of these stars is near 240 pc. There is a marked contrast between the Mira population at about 1 kpc from the Galactic center where there are nearly as many long-period oxygen-rich Miras as intermediate-period oxygen-rich Miras. It is hypothesized that, at about 1 kpc from the Galactic center, the main sequence stars with masses larger than 1 solar mass have higher metallicities than main-sequence stars with the same masses in the solar neighborhood. In the solar neighborhood such main sequence stars become carbon-rich on the AGB and in the region near the Galactic center they become long-period oxygen-rich Miras.

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