2010A&A...516L..15C


Query : 2010A&A...516L..15C

2010A&A...516L..15C - Astronomy and Astrophysics, volume 516, L15-15 (2010/6-3)

First Antarctica light curve. PAIX monitoring of the blazhko RR Lyrae star: S Arae.

CHADID M., VERNIN J., MEKARNIA D., CHAPELLIER E., TRINQUET H. and BONO G.

Abstract (from CDS):

In the context of long and continuous time-series photometry and after the MOST, CoRoT, KEPLER space missions and large geographic longitude ground-based networks, a new method is offered by the polar location helping to cope with the problem associated with the Earth's day-night cycle. We present the first long time -series photometry from Dome Charlie in the heart of Antarctica and analyze ∼4400 photometric measurements of RRLyrae star S Arae obtained in July and August 2007. The 40-cm telescope and Photometer AntarctIca eXtinction named PAIX were used for long photometric measurements with high time resolution and a duty cycle of 65%. The Fourier technique was used for the frequency analysis. New high-precision spectroscopic observations of S Arae were also collected using HARPS over one pulsation cycle of S Arae. We confirm the known radial fundamental period of 0.452 day. The high order of its harmonics shows the nonlinear nature of the radial mode. The Blazhko modulation is directly detected in the spectrum and shows a value around 48d. Together with the Blazhko frequency we also detected triplet structure components up to 15th order showing a nonlinear behavior of the Blazhko modulation. Thus, we conclude that S Arae is a bona fide Blazhko star. The data reveal that there are irregular changes in the S Arae atmosphere during the Blazhko cycle. A residual scatter phenomenon is detected and is more intense where the nonlinear effects are strongest. Therefore, the connection between temporal hydrodynamic phenomena and such modulation has to be taken into account in Blazhko models. High-precision CCD photometry with a very good time resolution can be undertaken at Dome Charlie in Antarctica, and it helps to complete astrophysical measurement time-series.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - methods: data analysis - techniques: photometric - shock waves - stars: variables: RR Lyrae - stars: atmospheres

VizieR on-line data: <Data not supplied by the author>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* AQ Leo RR* 11 23 55.2752313792 +10 18 59.076153504           kA5hF3.5 77 0
2 UCAC4 203-169513 * 17 58 58.7096441137 -49 25 24.736491264   13.140 12.117 11.905   ~ 2 0
3 TYC 8352-241-1 * 17 59 05.6813655168 -49 26 34.802322036   11.50 10.89 10.510   ~ 3 0
4 V* S Ara RR* 17 59 10.7331786216 -49 26 00.455959896   11.01 10.73     kA3hA7 104 0
5 NOMAD1 0405-0770258 * 17 59 16.3201 -49 26 07.739   12.610   12.350   ~ 1 0
6 NOMAD1 0405-0770296 * 17 59 18.3467 -49 27 18.520   17.420   15.450   ~ 1 0
7 V* V1127 Aql RR* 19 24 00.1009965936 +01 41 48.516499608   15.997 14.991 15.188   ~ 36 1
8 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 900 0

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2023.02.04-20:48:02

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