First chemical analysis of stars in the Triangulum-Andromeda star cloud

Mei Yin Chou; Steven R. Majewski; Katia Cunha; Verne V. Smith; Richard J. Patterson; David Martínez-Delgado

doi:10.1088/2041-8205/731/2/L30

First chemical analysis of stars in the Triangulum-Andromeda star cloud

Mei Yin Chou, Steven R. Majewski, Katia Cunha, Verne V. Smith, Richard J. Patterson, David Martínez-Delgado

Steward Observatory

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We undertake the first high-resolution spectroscopic study of the Triangulum-Andromeda (TriAnd) star cloud - an extended, mid-latitude Milky Way (MW) halo substructure about 20kpc away in the second Galactic quadrant - through six M giant star candidates selected to be both spatially and dynamically associated with this system. The abundance patterns of [Ti/Fe], [Y/Fe], and [La/Fe] as a function of [Fe/H] for these stars support TriAnd as having an origin in a dwarf galaxy with a chemical enrichment history somewhat similar to that of the Sagittarius dwarf spheroidal galaxy. We also investigate the previously proposed hypothesis that TriAnd is an outlying, dynamically older piece of the Monoceros Stream (also known as the Galactic Anticenter Stellar Structure, "GASS") under the assumption that both features come from the tidal disruption of the same accreted MW satellite and find that net differences in the above abundance patterns between the TriAnd and GASS stars studied suggest that these two systems are independent and unrelated.

Original language	English (US)
Article number	L30
Journal	Astrophysical Journal Letters
Volume	731
Issue number	2 PART II
DOIs	https://doi.org/10.1088/2041-8205/731/2/L30
State	Published - Apr 20 2011

Keywords

Galaxy: halo
Galaxy: structure
galaxies: interactions
stars: abundances

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1088/2041-8205/731/2/L30

Cite this

@article{2ef1b57bd9954e1987f27afbe3f2058b,

title = "First chemical analysis of stars in the Triangulum-Andromeda star cloud",

abstract = "We undertake the first high-resolution spectroscopic study of the Triangulum-Andromeda (TriAnd) star cloud - an extended, mid-latitude Milky Way (MW) halo substructure about 20kpc away in the second Galactic quadrant - through six M giant star candidates selected to be both spatially and dynamically associated with this system. The abundance patterns of [Ti/Fe], [Y/Fe], and [La/Fe] as a function of [Fe/H] for these stars support TriAnd as having an origin in a dwarf galaxy with a chemical enrichment history somewhat similar to that of the Sagittarius dwarf spheroidal galaxy. We also investigate the previously proposed hypothesis that TriAnd is an outlying, dynamically older piece of the Monoceros Stream (also known as the Galactic Anticenter Stellar Structure, {"}GASS{"}) under the assumption that both features come from the tidal disruption of the same accreted MW satellite and find that net differences in the above abundance patterns between the TriAnd and GASS stars studied suggest that these two systems are independent and unrelated.",

keywords = "Galaxy: halo, Galaxy: structure, galaxies: interactions, stars: abundances",

author = "Chou, {Mei Yin} and Majewski, {Steven R.} and Katia Cunha and Smith, {Verne V.} and Patterson, {Richard J.} and David Mart{\'i}nez-Delgado",

year = "2011",

month = apr,

day = "20",

doi = "10.1088/2041-8205/731/2/L30",

language = "English (US)",

volume = "731",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2 PART II",

}

TY - JOUR

T1 - First chemical analysis of stars in the Triangulum-Andromeda star cloud

AU - Chou, Mei Yin

AU - Majewski, Steven R.

AU - Cunha, Katia

AU - Smith, Verne V.

AU - Patterson, Richard J.

AU - Martínez-Delgado, David

PY - 2011/4/20

Y1 - 2011/4/20

N2 - We undertake the first high-resolution spectroscopic study of the Triangulum-Andromeda (TriAnd) star cloud - an extended, mid-latitude Milky Way (MW) halo substructure about 20kpc away in the second Galactic quadrant - through six M giant star candidates selected to be both spatially and dynamically associated with this system. The abundance patterns of [Ti/Fe], [Y/Fe], and [La/Fe] as a function of [Fe/H] for these stars support TriAnd as having an origin in a dwarf galaxy with a chemical enrichment history somewhat similar to that of the Sagittarius dwarf spheroidal galaxy. We also investigate the previously proposed hypothesis that TriAnd is an outlying, dynamically older piece of the Monoceros Stream (also known as the Galactic Anticenter Stellar Structure, "GASS") under the assumption that both features come from the tidal disruption of the same accreted MW satellite and find that net differences in the above abundance patterns between the TriAnd and GASS stars studied suggest that these two systems are independent and unrelated.

AB - We undertake the first high-resolution spectroscopic study of the Triangulum-Andromeda (TriAnd) star cloud - an extended, mid-latitude Milky Way (MW) halo substructure about 20kpc away in the second Galactic quadrant - through six M giant star candidates selected to be both spatially and dynamically associated with this system. The abundance patterns of [Ti/Fe], [Y/Fe], and [La/Fe] as a function of [Fe/H] for these stars support TriAnd as having an origin in a dwarf galaxy with a chemical enrichment history somewhat similar to that of the Sagittarius dwarf spheroidal galaxy. We also investigate the previously proposed hypothesis that TriAnd is an outlying, dynamically older piece of the Monoceros Stream (also known as the Galactic Anticenter Stellar Structure, "GASS") under the assumption that both features come from the tidal disruption of the same accreted MW satellite and find that net differences in the above abundance patterns between the TriAnd and GASS stars studied suggest that these two systems are independent and unrelated.

KW - Galaxy: halo

KW - Galaxy: structure

KW - galaxies: interactions

KW - stars: abundances

UR - http://www.scopus.com/inward/record.url?scp=79955609664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955609664&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/731/2/L30

DO - 10.1088/2041-8205/731/2/L30

M3 - Article

AN - SCOPUS:79955609664

SN - 2041-8205

VL - 731

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2 PART II

M1 - L30

ER -

First chemical analysis of stars in the Triangulum-Andromeda star cloud

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this