Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93..187b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 93, no. 1, p. 187-209
Astronomy and Astrophysics
Astrophysics
15
Astronomical Photometry, Blue Stars, Open Clusters, Red Giant Stars, Supergiant Stars, Cepheus Constellation, Color-Magnitude Diagram, Radial Velocity
Scientific paper
UBV CCD photometry has been carried out on the heavily reddened (Av = 6.7) Cepheus open cluster NGC 7419. An age of 14 +/- 2 million yr and a distance of 2.3 kpc have been derived using the isochrones of Maeder. The mass function of the cluster satisfies the Salpeter form N(M) is approximately M(-gamma) with gamma = 2.25. The cluster is dynamically relaxed. Radial velocities of the five red supergiants and the six brightest blue stars (mean approximately equals -74 km/s) confirm their membership. However, the radial velocity of the nearby carbon star (MZ Cep) is a factor of 2 too low for it to be a member. There is at most one blue supergiant member; this is much less than the number of red supergiants, in contrast with theoretical predictions. The red supergiants range in type from M2Iab to M7.5I, the coolest (MY Cep) -- an OH/IR source -- being strongly variable in the visible, but not in the IR. The two supergiants cooler than M2 do not fit the theoretical isochrones.
Beauchamp Alain
Drissen Laurent
Moffat Anthony F. J.
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