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
The Gaia-ESO Survey: Membership and initial mass function of the γ Velorum cluster / Prisinzano L.; Damiani F.; Micela G.; Jeffries R.D.; Franciosini E.; Sacco G.G.; Frasca A.; Klutsch A.; Lanzafame A.; Alfaro E.J.; Biazzo K.; Bonito R.; Bragaglia A.; Caramazza M.; Vallenari A.; Carraro G.; Costado M.T.; Flaccomio E.; Jofre P.; Lardo C.; Monaco L.; Morbidelli L.; Mowlavi N.; Pancino E.; Randich S.; Zaggia S.. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 589:(2016), pp. A70.A70-A70.A70. [10.1051/0004-6361/201527875]
The Gaia-ESO Survey: Membership and initial mass function of the γ Velorum cluster
Lardo C.Membro del Collaboration Group
;
2016
Abstract
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 0.5I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
