Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..161h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 161-168.
Astronomy and Astrophysics
Astrophysics
31
Binary Stars, Main Sequence Stars, Stellar Evolution, Stellar Luminosity, Stellar Mass, Dwarf Stars, Giant Stars, Late Stars, Subgiant Stars, Visible Spectrum
Scientific paper
A study on the distribution of Delta m of main-sequence visual binaries (VBs), derived using previously published data, suggests that the subgiants and early-type giants are one magnitude brighter than when they were dwarfs. The progenitors of late-type giants are on average F1 dwarfs, while those of VBs with Delta m of less than 8, 5, or 3 magnitudes are on average A7, A2, and B9.5 dwarfs, respectively. The intrinsic logarithmic distribution of the semimajor axis (a) is derived from dwarf, subgiant, and early-type giant VBs considered together, and is found to be constant for a of greater than 30 AU. Taking spectroscopic binaries into account, the proportion of single stars among all stellar systems is found to be at the most 23 percent.
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