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

We 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 Boiler & Chivens spectrograph at the 6.5-m Magellan I Telescope (Las Campanas Observatory, Chile). According to the spectra...

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Detalles Bibliográficos
Autores principales: Arias, Julia Inés, Barbá, Rodolfo Héctor, Morrell, Nidia Irene
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
Stars: formation
Stars: fundamental parameters
Stars: pre-main-sequence
Techniques: spectroscopic
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83219
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83219
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Stars: formation
Stars: fundamental parameters
Stars: pre-main-sequence
Techniques: spectroscopic
spellingShingle Ciencias Astronómicas
Stars: formation
Stars: fundamental parameters
Stars: pre-main-sequence
Techniques: spectroscopic
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Pre-main-sequence stars in the Lagoon Nebula (M8)
topic_facet Ciencias Astronómicas
Stars: formation
Stars: fundamental parameters
Stars: pre-main-sequence
Techniques: spectroscopic
description We 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 Boiler & 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 λ 6708 absorption line, we are able to identify 27 classical T Tauri stars, seven weak-lined T Tauri stars and three PMS emission objects with spectral type G, which we include in a separate stellar class denominated 'PMS Fe/Ge class'. Using near-infrared photometry either from the Two-Micron All-Sky Survey 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 × 106 yr and span over a range of masses between 0.8 and 2.5 M⊙. A cross-correlation between our spectroscopic data and the X-ray sources detected with the Chandra ACIS instrument is also presented.
format Articulo
Articulo
author Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_facet Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_sort Arias, Julia Inés
title Pre-main-sequence stars in the Lagoon Nebula (M8)
title_short Pre-main-sequence stars in the Lagoon Nebula (M8)
title_full Pre-main-sequence stars in the Lagoon Nebula (M8)
title_fullStr Pre-main-sequence stars in the Lagoon Nebula (M8)
title_full_unstemmed Pre-main-sequence stars in the Lagoon Nebula (M8)
title_sort pre-main-sequence stars in the lagoon nebula (m8)
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83219
work_keys_str_mv AT ariasjuliaines premainsequencestarsinthelagoonnebulam8
AT barbarodolfohector premainsequencestarsinthelagoonnebulam8
AT morrellnidiairene premainsequencestarsinthelagoonnebulam8
bdutipo_str Repositorios
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