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A multi-wavelength analysis of BL Her stars: Models versus Observations

Published online by Cambridge University Press:  06 February 2024

S. Das Open the ORCID record for S. Das [Opens in a new window] ,
L. Molnár ,
S. M. Kanbur ,
M. Joyce Open the ORCID record for M. Joyce [Opens in a new window] ,
A. Bhardwaj Open the ORCID record for A. Bhardwaj [Opens in a new window] ,
H. P. Singh ,
M. Marconi ,
V. Ripepi  and
R. Smolec
S. Das*
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, H-1121, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17., H-1121, Hungary
L. Molnár
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, H-1121, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17., H-1121, Hungary ELTE Eötvös Loránd University, Institute of Physics and Astronomy, 1117, Pázmány Péter sétány 1/A, Budapest, Hungary
S. M. Kanbur
Affiliation:
ELTE Eötvös Loránd University, Institute of Physics and Astronomy, 1117, Pázmány Péter sétány 1/A, Budapest, Hungary Department of Physics, State University of New York Oswego, Oswego, NY 13126, USA
M. Joyce
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklós út 15-17, H-1121, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17., H-1121, Hungary
A. Bhardwaj
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
H. P. Singh
Affiliation:
Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India
M. Marconi
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
V. Ripepi
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
R. Smolec
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, Poland
*
email: susmitadas130@gmail.com
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Abstract

We present new theoretical period–luminosity (PL) and period–radius (PR) relations at multiple wavelengths (Johnson–Cousins–Glass and Gaia passbands) for a fine grid of BL Herculis models computed using mesa-rsp. The non-linear models were computed for periods typical of BL Her stars, i.e. 1 ≤ P(days) ≤ 4, covering a wide range of input parameters: metallicity (−2.0 dex ≤ [Fe/H] ≤ 0.0 dex), stellar mass (0.5–0.8 ), luminosity (50–300 ) and effective temperature (full extent of the instability strip; in steps of 50K). We investigate the impact of four sets of convection parameters on multi-wavelength properties. Most empirical relations match well with theoretical relations from the BL Her models computed using the four sets of convection parameters. No significant metallicity effects are seen in the PR relations. Another important result from our grid of BL Her models is that it supports combining PL relations of RR Lyrae and Type II Cepheids together as an alternative to classical Cepheids for the extragalactic distance scale calibration.

Keywords

stars: oscillations (including pulsations)stars: Population IIstars: variables: Cepheidsstars: low-mass
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 105 - 114
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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