Variable Stars in the Globular Cluster NGC 288: [Fe/H] and Distance

• Autorzy: Arellano Ferro A. , Bramich D. M. , Giridhar S. , Figuera Jaimes R. , Kains N. , Kuppuswamy K.
• Języki publikacji: EN

Abstrakty

EN

A search for variable stars in the globular cluster NGC 288 was carried out using a time-series of CCD images in the V and I filters. The photometry of all stellar sources in the field of view of our images, down to V≈19 mag, was performed using difference image analysis (DIA). For stars of ≈15 mag, measurement accuracies of ≈8 mmag and ≈10 mmag were achieved for V and I respectively. Three independent search strategies were applied to the 5525 light curves but no new variables were found above the threshold limits characteristic of our data set. The use of older data from the literature combined with the present data allowed the refinement of the periods of all known variables. Fourier light curve decomposition was performed for the RRab and the RRc stars to obtain an estimate of [Fe/H]_ZW=-1.62±0.02 (statistical) ±0.14 (systematic). A true distance modulus of 14.768±0.003 mag (statistical) ±0.042 mag (systematic), or a distance of 8.99±0.01 kpc (statistical) ±0.17 kpc (systematic) was calculated from the RRab star. The RRc star predicts a discrepant distance about one kiloparsec shorter but it is possibly a Blazhko variable. An independent distance from the P-L relationship for SX Phe stars leads to a distance of 8.9±0.3 kpc.The SX Phe stars V5 and V9 are found to be double mode pulsators.

Słowa kluczowe

EN

lobular clusters: individual: NGC 288; stars: variables: RR Lyrae; stars: variables: delta Scuti

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2013
• Tom: Vol. 63, No. 4
• Strony: 429--451
• Opis fizyczny: Bibliogr. 44 poz., rys., tab., wykr.

Twórcy

autor

Arellano Ferro A.

• Instituto de Astronomia, Universidad Nacional Autónoma de México
• European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany

autor

Bramich D. M.

• European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
• Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, P.O. Box 5825, Doha, Qatar

autor

Giridhar S.

• Indian Institute of Astrophysics, Koramangala 560034, Bangalore, India

autor

Figuera Jaimes R.

• European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
• SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom

autor

Kains N.

• European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany

autor

Kuppuswamy K.

• Indian Institute of Astrophysics, Koramangala 560034, Bangalore, India

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