Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..527m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 527-534.
Astronomy and Astrophysics
Astrophysics
5
Calibrating, Infrared Spectroscopy, Magellanic Clouds, Near Infrared Radiation, Stellar Luminosity, Supergiant Stars, Interstellar Extinction, Stellar Magnitude, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
The possibility of using medium resolution spectrograms in the near infrared region to determine luminosities of A-G supergiants has been explored. A sample of 49 of these stars has been observed in the two Magellanic Clouds, and using the intensities of the O I 7774 triplet and an index (CP), which is a combination of the Ca II triplet and Paschen lines intensities, a preliminary luminosity calibration, based on LMC stars, has been obtained. Such a calibration predicts reliable luminosities for Galactic supergiants, and offers the advantage of being completely reddening independent. The reddening free CP index combined with BVRI color indices has also been used to estimate the interstellar reddenings of Magellanic Cloud stars.
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