Pre-main sequence stars in the Lagoon Nebula (M8)

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dc.creatorArias, Julia I.
dc.creatorBarba, Rodolfo H.
dc.creatorMorrell, Nidia I.
dc.date2006-11-05
dc.date.accessioned2026-07-07T10:24:09Z
dc.date.available2026-07-07T10:24:09Z
dc.descriptionWe report the discovery of new pre-main sequence (PMS) stars in the Lagoon Nebula (M8) at a distance of 1.25 kpc, based on intermediate resolution spectra obtained with the Boller & Chivens spectrograph at the 6.5-m Magellan I telescope (Las Campanas Observatory, Chile). According to the spectral types, the presence of emission lines and the lithium 6708A absorption line, we are able to identify 27 classical T Tauri stars, 7 weak-lined T Tauri stars and 3 PMS emission objects with spectral type G, which we include in a separated stellar class denominated "PMS Fe/Ge class". Using near-infrared photometry either from 2MASS or from our own previous work we derive effective temperatures and luminosities for these stars and locate them in the Hertzsprung-Russell diagram, in order to estimate their masses and ages. We find that almost all of our sample stars are younger than 3 10^6 years and span over a range of masses between 0.8 and 2.5 Msun. A cross-correlation between our spectroscopic data and the X-ray sources detected with the Chandra ACIS instrument is also presented.
dc.description18 pages, 15 figures, MNRAS, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0611150
dc.identifierhttp://arxiv.org/abs/astro-ph/0611150
dc.identifierMon.Not.Roy.Astron.Soc.374:1253-1263,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11217.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176088
dc.subjectAstrophysics
dc.titlePre-main sequence stars in the Lagoon Nebula (M8)
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