Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150..345t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 2, Sept. 1985, p. 345-349.
Astronomy and Astrophysics
Astrophysics
4
B Stars, Infrared Stars, Pre-Main Sequence Stars, Spectral Energy Distribution, Star Clusters, T Tauri Stars, Hertzsprung-Russell Diagram, Interstellar Extinction, Near Infrared Radiation, Open Clusters, Stellar Luminosity, Stellar Spectra, Stellar Temperature, Variable Stars
Scientific paper
From a study of the extinction-free spectral energy distribution of the star NGC 6611-W409 (R.A. = 18h16m07s, Dec. = -13°53arcmin38arcsec, 1950) the authors conclude that: (1) its Teff is ≡17,000K, corresponding to a spectral type B4 Ve, (2) the matter in its surroundings obeys a normal extinction law, characterized by R = 3.10. Furthermore, it has been shown that W409 is located at the distance of the open cluster NGC 6611. The strong variable near-IR excess of W409 is suggested to be caused by a luminous protostar of ≡0.5 M_sun; having a radius of ≡100 R_sun; and a luminosity varying between 25 and 110 L_sun;, located in the environment of the B4 Ve-type central star. This precursor of a T Tauri star is at the beginning of its Hayashi track.
Cuypers H.
Feinstein Alexander
Thé Pik-Sin
Tjin Djie R. E. H. A.
Westerlund Bengt E.
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