RR LYRAE ATMOSPHERICS: WRINKLES OLD AND NEW. A PREVIEW

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/141/1/6· OSTI ID:21443125

Preston, George W., E-mail: [e-mail] ^[1]

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1. Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

I report some results of an echelle spectroscopic survey of RR Lyrae stars begun in 2006 that I presented in my Henry Norris Lecture of 2010 January 4. Topics include (1) atmospheric velocity gradients, (2) phase-dependent envelope turbulence as it relates to Peterson's discoveries of axial rotation on the horizontal branch and to Stothers' explanation of the Blazhko effect, (3) the three apparitions of hydrogen emission during a pulsation cycle, (4) the occurrence of He I lines in emission and absorption, (5) detection of He II emission and metallic line doubling in Blazhko stars, and finally (6) speculation about what helium observations of RR Lyrae stars in omega Centauri might tell us about the putative helium populations and the horizontal branch of that strange globular cluster.

• OSTI ID: 21443125
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 1; Other Information: DOI: 10.1088/0004-6256/141/1/6; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
ATMOSPHERICS
EMISSION
HELIUM
HYDROGEN
STAR CLUSTERS
STARS
TURBULENCE
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GASES
NOISE
NONMETALS
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
RARE GASES
SORPTION