Characteristics of the Variable Star P Cygni Determined from Cluster Membership

Details Characteristics of the Variable Star P Cygni Determined from Cluster Membership Characteristics of the Variable Star P Cygni Determined from Cluster Membership

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001javso..29...73t&link_type=abstract

The Journal of the American Association of Variable Star Observers, vol. 29, no. 2, p. 73

Physics

4

P Cygni, Variable Stars

Scientific paper

Empirical information on the luminosity, reddening, age, and mass of the variable B2 Oe supergiant P Cygni is derived from its assumed membership in the sparse anonymous cluster on which it is projected, as well as its association with the spatially adjacent cluster IC 4996, which forms a double cluster with the P Cyg cluster. Evidence for the high luminosity of P Cyg is confirmed by its derived absolute magnitude of M(v) = -8.46 +/-0.03, which translates to log (L/L(solar)) = 5.54 +/-0.02 for an effective temperature consistent with the star's derived space reddening (E(B-V)=0.53 +/-0.02). More surprising is an age for the associated clusters of 6 (+/-1.5) x 10^6 years, corresponding to a turnoff point mass of 25.1 (+/-5.5 solar mass). By inference, P Cygni, as a post main-sequence object, should have a mass of no more than ~23-25 solar mass.

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