2011AJ....141....6P

Query : 2011AJ....141....6P

2011AJ....141....6P - Astron. J., 141, 6 (2011/January-0)

RR Lyrae atmospherics: wrinkles old and new. A preview.

PRESTON G.W.

Abstract (from CDS):

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.

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Journal keyword(s): stars: variables: RR Lyrae

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12635 1
2 V* X Ari RR* 03 08 30.8846437148 +10 26 45.218712967 9.45 9.25 8.97     F0.5 292 0
3 V* SV Eri RR* 03 11 52.1074067400 -11 21 14.067448524   10.34 9.96     A1III 129 0
4 V* CD Vel RR* 09 44 38.2454185174 -45 52 37.112073733   12.93 11.86   11.403 ~ 48 0
5 V* WY Ant RR* 10 16 04.9461830443 -29 43 42.417855880   11.03 10.78     kA2hA6 128 0
6 V* W Crt RR* 11 26 29.6452105074 -17 54 51.700992767   12.07 11.70     kF0.5hF6 125 0
7 V* SS Leo RR* 11 33 54.4934348315 -00 02 00.038460170   10.52       kA1.5hF1 169 0
8 V* DT Hya RR* 11 54 00.1884425581 -31 15 40.039838763     12.99     A2 30 0
9 V* AS Vir RR* 12 52 45.8688674184 -10 15 36.381028212   12.37 11.90     kA9.5hF5 71 0
10 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3423 0
11 V* RV Oct RR* 13 46 31.7442284943 -84 24 06.384454864   11.39 10.94     ~ 95 0
12 V* XZ Aps RR* 14 52 05.4231924775 -79 40 46.572766688           ~ 65 0
13 V* AN Ser RR* 15 53 31.0531421656 +12 57 40.112740009   11.32 10.93     kA7hA8.5 138 0
14 V* BS Aps RR* 16 20 51.5043003105 -71 40 15.720490837   12.48 12.03     ~ 46 0
15 V* V445 Oph RR* 16 24 41.2156082791 -06 32 29.928559328   11.59 11.30     kF7.5hF6 131 0
16 V* UV Oct RR* 16 32 25.5361202856 -83 54 10.495880892   9.80 9.44     A8/F0Ia/ab(w) 125 0
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14393 0
18 V* S Ara RR* 17 59 10.7331786216 -49 26 00.455959896   11.01 10.73     kA3hA7 111 0
19 V* MV Lyr CV* 19 07 16.2886463256 +44 01 07.869892008   13.040 12.920 12.489 12.578 M5Ve 286 0
20 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
21 V* V1645 Sgr RR* 20 20 44.4775833912 -41 07 05.783708028   11.72 11.39     ~ 36 0
22 V* Z Mic RR* 21 16 22.7047906743 -30 17 03.065542503   11.58 11.37     kF3hF8 73 0
23 V* TY Gru RR* 22 16 39.4204602572 -39 56 17.947129636   14.64 14.10     ~ 38 0

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