Letters of Intent received in 2019

LoI 2021-2058
Period-Luminosity Relationships

Date: 12 April 2021 to 16 April 2021
Category: Non-GA Symposium
Location: Budapest, Hungary
Contact: Richard de Grijs (richard.de-grijs@mq.edu.au)
Coordinating division: Division G Stars and Stellar Physics
Other divisions: Division H Interstellar Matter and Local Universe
Division J Galaxies and Cosmology
Co-Chairs of SOC: Richard de Grijs (Macquarie University)
Laszlo Kiss (Konkoly Observatory)
Co-Chairs of LOC: Laszlo Szabados (Konkoly Observatory)
Laszlo Kiss (Konkoly Observatory)
Robert Szabo (Konkoly Observatory)



Stellar variability
Cosmic distance scale
Pulsation physics
Interstellar medium
Infrared astronomy



The period-luminosity relation (PLR) is an important relationship between the fundamental properties of a diverse range of variable stars. Most famous is the PLR of Cepheids, which renders classical Cepheids as primary distance indicators in establishing the cosmic distance scale. In addition, tight relationships also exist between the periods and luminosities of other pulsating variable stars, including RR Lyrae-type variables, Type II Cepheids, delta Scuti-type pulsators, and Mira variables. Curiously, not only pulsating stars exhibit PLRs: such a relationship also exists for contact binaries of W UMa type.

The ultimate aim of the meeting is to discuss recent results - both observational and theoretical - achieved by studying the PLR, including its shape and calibration, and the dependence on other physical parameters. This topic is very timely indeed, given the wealth of empirical data obtained by the Gaia mission and the impending operations of the James Webb Space Telescope.