Absorption line radial velocities of Miras

Details Absorption line radial velocities of Miras Absorption line radial velocities of Miras

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...72..463b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 72, no. 3, March 1988, p. 463-472.

Astronomy and Astrophysics

Astrophysics

21

Absorption Spectra, Line Spectra, Mira Variables, Radial Velocity, Atmospheric Models, Cross Correlation, Shock Waves

Scientific paper

The absorption-line radial velocities (ARVs) of 20 Mira stars are determined on the basis of observations made at the Observatoire de Haute-Provence over a 5-yr period: (1) 2-nm/mm-dispersion 352-510-nm spectra obtained with a coude spectrograph on the 1.52-m telescope and measured using a Ferranti machine with 14 moire fringes and (2) photoelectric radial velocities obtained with the Coravel cross-correlation spectrometer on the 1-m Swiss telescope. The data, including complete-period coverage for eight of the stars, are presented in tables and graphs and compared in detail. No variation in ARV is found in Omicron Cet and S CrB, and no peak-to-peak variation in excess of 10 km/s is observed, the mean rms ARV being 2.5 km/s. Published radio (OH) radial velocities for these objects are shown to be blueshifted relative to the ARVs, implying infall of absorbing matter (perhaps due to repetitive shock waves).

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