Statistical Properties of Galactic {\delta} Scuti Stars: Revisited

TL;DR

This study compiles and analyzes statistical properties of 1,578 { extdelta} Scuti stars in the Milky Way, updating their data and examining correlations among physical properties, while identifying rare X-ray and UV counterparts for further research.

Contribution

The paper provides an updated, comprehensive catalog of { extdelta} Scuti stars with refined physical parameters and cross-matched X-ray/UV data, confirming known property correlations and highlighting rare multi-wavelength counterparts.

Findings

Majority of stars have periods 0.02-0.25 days and amplitudes <0.5 mag.

Correlations between physical properties are consistent with previous studies.

Identified 27 X-ray and 41 UV counterparts for { extdelta} Scuti stars.

Abstract

We present statistical characteristics of 1,578 {\delta} Scuti stars including nearby field stars and cluster member stars within the Milky Way. We obtained 46% of these stars (718 stars) from the works done by Rodr\'{i}guez and collected the remaining 54% stars (860 stars) from other literatures. We updated the entries with the latest information of sky coordinate, color, rotational velocity, spectral type, period, amplitude and binarity. The majority of our sample are well characterized in terms of typical period range (0.02-0.25 days), pulsation amplitudes (<0.5 mag) and spectral types (A-F type). Given this list of {\delta} Scuti stars, we examined relations between their physical properties (i.e., periods, amplitudes, spectral types and rotational velocities) for field stars and cluster members, and confirmed that the correlations of properties are not significantly different from those reported in the Rodr\'{i}guez's works. All the {\delta} Scuti stars are cross-matched with several X-ray and UV catalogs, resulting in 27 X-ray and 41 UV-only counterparts. These counterparts are interesting targets for further study because of their rarity and uniqueness in showing {\delta} Scuti-type variability and X-ray/UV emission at the same time. The compiled catalog can be accessed through the web interface http://stardb.yonsei.ac.kr/DeltaScuti