The classification of intrinsic variable. III. Calibration of the luminosities of small amplitude red variables in the old disk population

Abstract

view Abstract Citations (33) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The classification of intrinsic variables. Calibration of luminosities of small amplitude red variables in the old disk population. Eggen, O. J. Abstract Nineteen small-amplitude (less than 0.5 mag in VE) red variables in the Hyades and old disk population groups, including 14 new variables ( Gem, HR 4333, E Oct, HD 80367, HR 4184, HR 4463, E Mus, HR 1003, HD 111499, HR 7625, 27 Cnc, HD 115332, HD 123598 and HR 3331) are used to the ( , R - I) relation. This calibration is tested with (1) FG Vul in NGC 6940, on the basis of (R, I) observations of several of the G- and K-type giants in that cluster, (2) the wide binary HR 6020, which is variable, and HR 6021, and (3) the estimates of luminosity from H and K emission widths. The similarities, in the quasi-periodic nature and changes in form of light curves, between the small-amplitude red variables and the ultrashortperiod Cepkeids is demonstrated with a new variable of each type; HR 7023 (M4, P 50d) and HR 359 (A7 III, P Subject headings: late-type stars - luminosities - open clusters - variable stars Publication: The Astrophysical Journal Pub Date: March 1973 DOI: 10.1086/152012 Bibcode: 1973ApJ...180..857E full text sources ADS | data products SIMBAD (26) GCPD (1) Related Materials (8) Part 1: 1972ApJ...174...45E Part 2: 1972ApJ...177..489E Part 4: 1973ApJ...184..793E Part 5: 1975ApJ...195..661E Part 6: 1977ApJS...34....1E Part 7: 1977ApJ...213..767E Part 8: 1979ApJS...41..413E Part 9: 1983AJ.....88..361E