Period-Luminosity Relations for Galactic Type II Cepheids in the Sloan bands
arXiv:2503.10532 · doi:10.1051/0004-6361/202553733
Abstract
Type II Cepheids (T2Ceps), alongside RR Lyrae stars, serve as important distance indicators for old population II stars due to their period-luminosity (PL) relations. However, studies of these relations in the Sloan photometric system are rather limited in the literature. Our goal is to calibrate PL relations (and their counterparts in Wesenheit magnitudes) in the Sloan-Pan-STARRS gP1rP1iP1 bands for Galactic T2Ceps located in the vicinity of the Sun. We collected data for 16 T2Ceps of the BLHer type and 17 of the WVir type using 40 cm telescopes of the Las Cumbres Observatory Global Telescope Network. Geometric parallaxes were adopted from Gaia Data Release 3. We have calibrated PL and period-Wesenheit relations for Milky Way BLHer and WVir stars in the solar neighborhood, as well as for a combined sample of both types. The relationships derived here will allow to determine the distances to T2Ceps that will be discovered by the Legacy Survey of Space and Time survey and, in turn, to probe the extended halo of the Milky Way, as well as the halos of nearby galaxies. To the best of our knowledge, the relations derived in this study are the first for Milky Way T2Ceps in the Sloan bands.
Comments: 20 pages, 11 figures, 3 tables, Accepted for publication in A&A
References in corpus (25)
- Array Programming with NumPy
- The NumPy array: a structure for efficient numerical computation
- Gaia Data Release 3: Summary of the content and survey properties
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
- Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
- Three-dimensional mapping of the local interstellar medium with composite data
- The distance to the Galactic Centre based on Population-II Cepheids and RR Lyrae stars
- The period-luminosity relation for type II Cepheids in globular clusters
- Gaia DR3: Specific processing and validation of all-sky RR Lyrae and Cepheid stars -- The Cepheid sample
- The parallax zero point offset from Gaia EDR3 data
- The VMC Survey. XIII. Type II Cepheids in the Large Magellanic Cloud
- Clustering of Local Group distances: publication bias or correlated measurements? II. M31 and beyond
- The influence of metallicity on the Leavitt Law from geometrical distances of Milky Way and Magellanic Clouds Cepheids
- Large Magellanic Cloud Near-Infrared Synoptic Survey. IV. Leavitt Laws for Type II Cepheid Variables
- A sub-2% Distance to M31 from Photometrically Homogeneous Near-Infrared Cepheid Period-Luminosity Relations Measured with the Hubble Space Telescope
- The period-luminosity and period-radius relations of Type II and anomalous Cepheids
- Synthetic properties of bright metal-poor variables. II. BL Her stars
- Galactic Bulge Population II Cepheids in the VVV Survey: Period-Luminosity Relations and a Distance to the Galactic Center
- A theoretical framework of BL Her stars. I. Effect of metallicity and convection parameters on period-luminosity and period-radius relations
- An absolute calibration of the near-infrared Period-Luminosity Relations of Type II Cepheids in the Milky Way and in the Large Magellanic Cloud
- Zwicky Transient Facility and Globular Clusters: The Period-Luminosity and Period-Wesenheit Relations for Type II Cepheids
- Type II Cepheids Pulsating in the First Overtone from the OGLE Survey
- Near-infrared observations of RR Lyrae and Type II Cepheid variables in the metal-rich bulge globular cluster NGC 6441
- Period-Luminosity Relations for Galactic classical Cepheids in the Sloan bands