Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..700z&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 700-708.
Astronomy and Astrophysics
Astrophysics
35
Cepheid Variables, Globular Clusters, Stellar Mass, Stellar Oscillations, Variable Stars, Giant Stars, Horizontal Branch Stars, Stellar Gravitation, Stellar Temperature
Scientific paper
The effective temperature and surface gravity of the anomalous Cepheid V19 in NGC 5466 have been measured from spectrophotometric scans. The position of V19 in the θe -log g diagram rules out the possibilities that it is an RR Lyrae or a BL Herculis variable, which strengthens the already strong case that V19 is an unusual Cepheid variable and a member of NGC 5466. It had been shown earlier by Zinn and Dalin that V19 has the same radial velocity as NGC 5466 and a period (0.82 days) and luminosity (Mυ = -1.27) that are similar to those of the anomalous Cepheids in the dwarf spheroidal galaxies. Our observations of V19 have been compared with similar ones of three horizontal branch (HB) stars in NGC 5466 and the type c RR Lyrae variable TV Boo. The following mass ratios are obtained: M(V19)/(HB) = 1.64±0.76 and M(V19)/M(TV Boo) = 2.03±0.62. The surface gravity measurements indicate that V19 is pulsating in the first harmonic rather than the fundamental mode. Assuming the first harmonic mode for V19 and TV Boo, the Q = Pl/2 relation yields: M1(V19)/(TV Boo) = 2.33 ± 0.40. Thus, it appears that V19 is approximately twice as massive as HB stars. The Q = Pl/2 relation yields the most precise estimate for V19's mass, l.56+0.23-0.03 Msun, which is consistent with the theory that the large masses of the anomalous Cepheids result from the transfer of mass in close binary systems.
King Ronald C.
Zinn Robert
No associations
LandOfFree
The mass of the anomalous cepheid in the globular cluster NGC 5466 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 The mass of the anomalous cepheid in the globular cluster NGC 5466, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The mass of the anomalous cepheid in the globular cluster NGC 5466 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1756362