Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry

Details Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..114d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 114-124.

Astronomy and Astrophysics

Astrophysics

111

Diameters, Giant Stars, Late Stars, Michelson Interferometers, Stellar Temperature, Infrared Interferometers, K Stars, M Stars, Stellar Atmospheres, Stellar Color, Stellar Spectrophotometry

Scientific paper

Accurate angular diameters of cool bright giants have been measured at 2.2 μm by the I2T interferometer, operating at the CERGA observatory. The derived effective temperatures, with an average internal accuracy of ±61 K have been adopted as a high-quality reference sample to improve both the empirical effective temperature scale for K-M giants and the semiempirical estimations of T eff. In the colour diagrams, the new calibration shows evidence of a fine structure, arising in the transition from K to M spectral-type, with fairly different behaviours for the two branches. It is strengthened that the K-scale does not require to be revised, being in excellent agreement with results from model atmospheres. The M-scale should be lowered towards the color temperature, approaching the M0 spectral-type; this appears quite consistent with a recent theoretical investigation. The semiempirical methods by the flux distribution and the near-infrared flux have been checked by a multi-object analysis. Both of them are found to be affected by a small systematic bias. By compensating for this effect, most of the estimated values of Teff become consistent to each other and with the measured one, within a maximum error of ±50 K.

Affiliated with

Also associated with

No associations

Rating

Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Accurate angular diameters and effective temperatures for eleven giants cooler than K0 by Michelson interferometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-899773