Published in

Hans Publishers, Astronomy & Astrophysics, (600), p. A20

DOI: 10.1051/0004-6361/201629929

Hans Publishers, Astronomy & Astrophysics, (602), p. A33

DOI: 10.1051/0004-6361/201630108

Hans Publishers, Astronomy & Astrophysics, (605), p. A66

DOI: 10.1051/0004-6361/201730850

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X-shooter spectroscopy of young stellar objects in Lupus

Journal article published in 2017 by M. Zusi, J. M. Alcalá ORCID, L. Testi, A. Frasca ORCID, A. Natta ORCID, J. P. Williams ORCID, C. F. Manara ORCID, S. Randich, K. Biazzo ORCID, B. Nisini ORCID, B. Stelzer, E. Covino ORCID, S. Antoniucci ORCID, M. Esposito, F. Getman ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present the results of a study of the stellar and accretion properties of the (almost) complete sample of class II and transitional YSOs in the Lupus I, II, III and IV clouds, based on spectroscopic data acquired with the VLT/X-Shooter spectrograph. Our study combines the dataset from our previous work with new observations of 55 additional objects. We have investigated 92 YSO candidates in total, 11 of which have been definitely identified with giant stars unrelated to Lupus. The stellar and accretion properties of the 81 bona fide YSOs, which represent more than 90% of the whole class~II and transition disc YSO population in the aforementioned Lupus clouds, have been homogeneously and self-consistently derived, allowing for an unbiased study of accretion and its relationship with stellar parameters. The accretion luminosity, Lacc, increases with the stellar luminosity, Lstar, with an overall slope of ~1.6, similar but with a smaller scatter than in previous studies. There is a significant lack of strong accretors below Lstar~0.1Lsun, where Lacc is always lower than 0.01Lstar. We argue that the Lacc-Lstar slope is not due to observational biases, but is a true property of the Lupus YSOs. The logMacc-logMstar correlation shows a statistically significant evidence of a break, with a steeper relation for Mstar