Prisinzano, L, Damiani, F, Micela, G, Jeffries, RD, Franciosini, E, Sacco, GG, Frasca, A, Klutsch, A, Lanzafame, A, Alfaro, EJ, Biazzo, K, Bonito, R, Bragaglia, A, Caramazza, M, Vallenari, A, Carraro, G, Costado, MT, Flaccomio, E, Jofre, P, Lardo, C, Monaco, L, Morbidelli, L, Mowlavi, N, Pancino, E, Randich, S and Zaggia, S (2016) The Gaia-ESO Survey: membership and initial mass function of the. Velorum cluster. ASTRONOMY & ASTROPHYSICS, 589. ISSN 1432-0746

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Context. Understanding the properties of young open clusters, such as the initial mass function (IMF), star formation history, and dynamic evolution, is crucial for obtaining reliable theoretical predictions of the mechanisms involved in the star formation process.

Aims. We want to obtain a list that is as complete as possible of confirmed members of the young open cluster γ Velorum, with the aim of deriving general cluster properties such as the IMF.

Methods. We used all available spectroscopic membership indicators within the Gaia-ESO public archive, together with literature photometry and X-ray data, and for each method, we derived the most complete list of candidate cluster members. Then, we considered photometry, gravity, and radial velocities as necessary conditions for selecting a subsample of candidates whose membership was confirmed by using the lithium and Hα lines and X-rays as youth indicators.

Results. We found 242 confirmed and 4 possible cluster members for which we derived masses using very recent stellar evolutionary models. The cluster IMF in the mass range investigated in this study shows a slope of α = 2.6 ± 0.5 for 0.5 <M/M⊙< 1.3 and α = 1.1 ± 0.4 for 0.16 <M/M⊙< 0.5, and it is consistent with a standard IMF.

Conclusions. The similarity of the IMF of the young population around γ2Vel to that in other star-forming regions and the field suggests it may have formed through very similar processes.

Item Type: Article
Additional Information: This work has been made available online in accordance with publisher policy
Uncontrolled Keywords: stars: pre-main sequence; open clusters and associations: individual: yVelorum; stars: formation; stars: luminosity function, mass function; techniques: radial velocities; techniques: spectroscopic
Subjects: Q Science > QB Astronomy

Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 07 Nov 2016 11:14
Last Modified: 15 Apr 2019 07:57

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