Lumnosity attenuation and distances of red giant stars

Details Lumnosity attenuation and distances of red giant stars Lumnosity attenuation and distances of red giant stars

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs...98..701c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 98, no. 2, p. 701-738

Astronomy and Astrophysics

Astrophysics

8

Distance, Late Stars, Red Giant Stars, Star Distribution, Stellar Luminosity, Stellar Magnitude, Stellar Spectra, Variable Stars, Astronomical Photometry, Astronomical Spectroscopy, Dark Matter, Infrared Astronomy Satellite, Missing Mass (Astrophysics)

Scientific paper

The Mv of M red variable stars is increased by the molecular TiO bands which grow from M0 to M10 in an inherent spectral darkening sequence. The Mv is the result of both the effective visual flux and the equivalent radius. The equivalent radius is apparently smaller than the empirical radius due to a molecular covering process in stars later than M3. The full range of optical red giant stars forms a sequence from the brightest M early spectral types (S Car, M0(max), Mv approx = -3.2 mag) to the faintest M-latest spectral types (IK Tau, M10.5 min), Mv approx. = 16.5 mag). The typical Miras and SR stars of M-medium and M-late spectral types are between these two extremes. The sequence has a range of 20 mag on the visual (HR) diagram which extends from the red giant branch (RGB) passing beyond the Mv of red dwarf stars as far as the point where it intercepts with the prolongation of the zero-age main sequence (ZAMS) in the latest spectral type. Typical M10-stars at 200 pc has a V approx. = 20 mag. M-latest stars at larger distances are unobservable stars in the visual band. The distances of 134 variable stars are also given. The distances to 86 stars were determined by using a pure photometric method, while preliminary distances (less than 200 pc) for the remaining 48 M-latest stars were determined by the spectral-photometric method. Since the local stellar density of M stars up to 100 pc rises at least 7.5 times, it is possible to discuss that the long-standing problem of dark matter in spiral galaxies could be resolved by these very dim massive giant stars and by the molecular covered stars at the extreme end of the attenuating sequence. Furthermore, post M-latest stars may be the only nonvisual stellar objects that can explain the enormous quantity of faint and point infrared sources found by IRAS. These weak objects suggest the existence of an infrared Milky Way which is more dense than the optical one.

Affiliated with

Also associated with

No associations

Rating

Lumnosity attenuation and distances of red giant stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Lumnosity attenuation and distances of red giant stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lumnosity attenuation and distances of red giant stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1203088