2025ApJ...994..248F

Query : 2025ApJ...994..248F

2025ApJ...994..248F - Astrophys. J., 994, 248 (2025/December-1)

A Comprehensive Gaia Spectroscopic Study of Stars in the Scorpius-Centaurus Complex: Star Formation History and Disk Lifetime.

FANG M. and HERCZEG G.J.

Abstract (from CDS):

We re-evaluate the star formation history of the nearby Scorpius-Centaurus (Sco-Cen) OB Association with a comprehensive analysis of Gaia XP spectra of more than 7800 potential members. New spectral classifications are obtained by fitting individual XP spectra with templates derived from empirical spectra of young stars. Combining these spectral classifications in this work and in the literature with archival photometry leads to estimates of V-band extinction and stellar luminosities for a total of 8846 sources. Employing SPOTS models with spot coverages of 0.34 and 0.51 for K- and M-type stars harmonizes age estimates between K/M-type and F/G-type stars, with ages older than are obtained for low-mass stars from standard evolutionary models. These older ages lead to a disk lifetime that is approximately two times longer than reported in previous literature. Our re-evaluation of the star formation history with these revised age estimates uncovers evidence of underlying substructures within the Sco-Cen complex.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Star formation - Low mass stars - OB associations - Stellar associations

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 EM* LkCa 4 Or* 04 16 28.1067298272 +28 07 35.731363080   13.96 12.78 11.825   K7:Ve 208 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
4 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
5 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
6 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
8 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
9 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
10 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
11 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
12 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
13 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
14 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
15 NAME V1062 Sco Moving Group MGr 16 42 -39.7           ~ 9 0
16 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0

To bookmark this query, right click on this link: simbad:objects in 2025ApJ...994..248F and select 'bookmark this link' or equivalent in the popup menu