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2017ApJ...838..150K - Astrophys. J., 838, 150-150 (2017/April-1)

The greater Taurus-Auriga ecosystem. I. There is a distributed older population.


Abstract (from CDS):

The census of Taurus-Auriga has been assembled over seven decades and inherited the biases and incompleteness of the input studies. The unusual shape of its inferred initial mass function (IMF) and the existence of isolated disk-bearing stars suggest that additional (likely disk-free) members remain to be discovered. We therefore have begun a global reassessment of the census of Taurus-Auriga that exploits new data and better definitions of youth and kinematic membership. As a first step, we reconsider the membership of all disk-free candidate members from the literature with spectral type >=F0, 3h50m α5h40m, and 14δ34○^. We combine data from the literature with Keck/HIRES and UH88/SNIFS spectra to test the membership of these candidates using the positions in the Hertzsprung-Russel diagram, proper motions, radial velocities, Hα, lithium, and surface gravity. We find 218 confirmed or likely Taurus members, 160 confirmed or likely interlopers, and only 18 that lack sufficient evidence to draw firm conclusions. A significant fraction of these stars (81/218 = 37%) are not included in the most recent canonical member lists. There are few additional members to the immediate vicinity of the molecular clouds, preserving the IMFs that have been deemed anomalous in past work. Many of the likely Taurus members are instead distributed broadly across the search area. When combined with the known disk hosts, our updated census reveals two regimes: a high-density population with a high disk fraction (indicative of youth) that broadly traces the molecular clouds, and a low-density population with low disk fraction (hence likely older) that most likely represents previous generations of star formation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): open clusters and associations: individual: Taurus-Auriga - stars: formation - stars: pre-main sequence - stars: protostars - stars: protostars

VizieR on-line data: <Available at CDS (J/ApJ/838/150): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat refs.dat>

Simbad objects: 421

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