Kavli Affiliate: Gregory J. Herczeg
| First 5 Authors: Min Fang, Min Fang, , ,
| Summary:
We re-evaluate the star formation history of the nearby Sco-Cen OB
Association with a comprehensive analysis of Gaia XP spectra of more than 7,800
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 8,846 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.
| Search Query: ArXiv Query: search_query=au:”Gregory J. Herczeg”&id_list=&start=0&max_results=3