Cousins VRI standard stars in the M 67 dipper asterism
نویسندگان
چکیده
منابع مشابه
Chemical composition of evolved stars in the open cluster M 67 ⋆
High-resolution spectra of six core heliumburning ‘clump’ stars and three giants in the open cluster M 67 have been obtained with the SOFIN spectrograph on the Nordic Optical Telescope to investigate abundances of up to 25 chemical elements. Abundances of carbon were studied using the C2 Swan (0,1) band head at 5635.5 Å. The wavelength interval 7980–8130 Å with strong CN features was analysed i...
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We investigate the average similarity of random strings as captured by the average number of “cousins” in the underlying tree structures. Analytical techniques including poissonization and the Mellin transform are used for accurate calculation of the mean. The string alphabets we consider are m– ary, and the corresponding trees are m–ary trees. Certain analytic issues arise in the m–ary case th...
متن کاملMultisite campaign on the open cluster M 67 . II . Evidence for solar - like oscillations in red giant stars
Measuring solar-like oscillations in an ensemble of stars in a cluster, holds promise for testing stellar structure and evolution more stringently than just fitting parameters to single field stars. The most ambitious attempt to pursue these prospects was by Gilliland et al. (1993) who targeted 11 turn-off stars in the open cluster M67 (NGC 2682), but the oscillation amplitudes were too small (...
متن کاملMOST satellite photometry of stars in the M 67 field : Eclipsing binaries , blue stragglers and δ Scuti variables ⋆
We present two series of MOST (Microvariability & Oscillations of STars) space-based photometry, covering nearly continuously 10 days in 2004 and 30 days in 2007, of selected variable stars in the upper Main Sequence of the old open cluster M67. New high-precision light curves were obtained for the blue-straggler binary/triple systems AH Cnc, ES Cnc and EV Cnc. The precision and phase coverage ...
متن کاملThe Ofpe/wn9 Stars in M 33
We present HST/STIS Ultraviolet spectra of the six known Ofpe/WN9 stars (“slash stars”) in M 33. These stars were selected for showing the characteristics of the Ofpe/WN9 class from previous optical ground-based spectroscopy. The UV spectra are rich in wind lines, whose strength and terminal velocity vary greatly among our target sample. We analyse the STIS spectra with non-LTE, line blanketed,...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1990
ISSN: 0004-6280,1538-3873
DOI: 10.1086/132730