The solar neighborhood. XXVI. AP Col: The closest (8.4pc) pre-main-sequence star

Adric R. Riedel; Simon J. Murphy; Todd J. Henry; Carl Melis; Wei Chun Jao; John P. Subasavage

doi:10.1088/0004-6256/142/4/104

The solar neighborhood. XXVI. AP Col: The closest (8.4pc) pre-main-sequence star

Adric R. Riedel^*, Simon J. Murphy, Todd J. Henry, Carl Melis, Wei Chun Jao, John P. Subasavage

^*Corresponding author for this work

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

57 Citations (Scopus)

Abstract

We present the results of a multi-technique investigation of the M4.5Ve flare star AP Col, which we discover to be the nearest pre-main-sequence star. These include astrometric data from the CTIO 0.9 m, from which we derive a proper motion of 342.0 ± 0.5masyr^-1, a trigonometric parallax of 119.21 ± 0.98mas (8.39 ± 0.07pc), and photometry and photometric variability at optical wavelengths. We also provide spectroscopic data, including radial velocity (22.4 ± 0.3kms^-1), lithium equivalent width (EW) (0.28 ± 0.02 Å), Hα EW (-6.0 to -35), vsin i (11 ± 1kms^-1), and gravity indicators from the Siding Spring 2.3m WiFeS, Lick 3m Hamilton echelle, and Keck-I HIRES echelle spectrographs. The combined observations demonstrate that AP Col is the closer of only two known systems within 10pc of the Sun younger than 100Myr. Given its space motion and apparent age of 12-50Myr, AP Col is likely a member of the recently proposed ∼ 40Myr old Argus/IC 2391 Association.

Original language	English
Article number	104
Journal	Astronomical Journal
Volume	142
Issue number	4
DOIs	https://doi.org/10.1088/0004-6256/142/4/104
Publication status	Published - Oct 2011

Access to Document

10.1088/0004-6256/142/4/104

Cite this

@article{1f4b205a2db84cb39a20c0d823e489e9,

title = "The solar neighborhood. XXVI. AP Col: The closest (8.4pc) pre-main-sequence star",

abstract = "We present the results of a multi-technique investigation of the M4.5Ve flare star AP Col, which we discover to be the nearest pre-main-sequence star. These include astrometric data from the CTIO 0.9 m, from which we derive a proper motion of 342.0 ± 0.5masyr-1, a trigonometric parallax of 119.21 ± 0.98mas (8.39 ± 0.07pc), and photometry and photometric variability at optical wavelengths. We also provide spectroscopic data, including radial velocity (22.4 ± 0.3kms-1), lithium equivalent width (EW) (0.28 ± 0.02 {\AA}), Hα EW (-6.0 to -35), vsin i (11 ± 1kms-1), and gravity indicators from the Siding Spring 2.3m WiFeS, Lick 3m Hamilton echelle, and Keck-I HIRES echelle spectrographs. The combined observations demonstrate that AP Col is the closer of only two known systems within 10pc of the Sun younger than 100Myr. Given its space motion and apparent age of 12-50Myr, AP Col is likely a member of the recently proposed ∼ 40Myr old Argus/IC 2391 Association.",

keywords = "astrometry, parallaxes, solar neighborhood, stars: low-mass, stars: pre-main sequence, techniques: spectroscopic",

author = "Riedel, \{Adric R.\} and Murphy, \{Simon J.\} and Henry, \{Todd J.\} and Carl Melis and Jao, \{Wei Chun\} and Subasavage, \{John P.\}",

year = "2011",

month = oct,

doi = "10.1088/0004-6256/142/4/104",

language = "English",

volume = "142",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "4",

}

TY - JOUR

T1 - The solar neighborhood. XXVI. AP Col

T2 - The closest (8.4pc) pre-main-sequence star

AU - Riedel, Adric R.

AU - Murphy, Simon J.

AU - Henry, Todd J.

AU - Melis, Carl

AU - Jao, Wei Chun

AU - Subasavage, John P.

PY - 2011/10

Y1 - 2011/10

N2 - We present the results of a multi-technique investigation of the M4.5Ve flare star AP Col, which we discover to be the nearest pre-main-sequence star. These include astrometric data from the CTIO 0.9 m, from which we derive a proper motion of 342.0 ± 0.5masyr-1, a trigonometric parallax of 119.21 ± 0.98mas (8.39 ± 0.07pc), and photometry and photometric variability at optical wavelengths. We also provide spectroscopic data, including radial velocity (22.4 ± 0.3kms-1), lithium equivalent width (EW) (0.28 ± 0.02 Å), Hα EW (-6.0 to -35), vsin i (11 ± 1kms-1), and gravity indicators from the Siding Spring 2.3m WiFeS, Lick 3m Hamilton echelle, and Keck-I HIRES echelle spectrographs. The combined observations demonstrate that AP Col is the closer of only two known systems within 10pc of the Sun younger than 100Myr. Given its space motion and apparent age of 12-50Myr, AP Col is likely a member of the recently proposed ∼ 40Myr old Argus/IC 2391 Association.

AB - We present the results of a multi-technique investigation of the M4.5Ve flare star AP Col, which we discover to be the nearest pre-main-sequence star. These include astrometric data from the CTIO 0.9 m, from which we derive a proper motion of 342.0 ± 0.5masyr-1, a trigonometric parallax of 119.21 ± 0.98mas (8.39 ± 0.07pc), and photometry and photometric variability at optical wavelengths. We also provide spectroscopic data, including radial velocity (22.4 ± 0.3kms-1), lithium equivalent width (EW) (0.28 ± 0.02 Å), Hα EW (-6.0 to -35), vsin i (11 ± 1kms-1), and gravity indicators from the Siding Spring 2.3m WiFeS, Lick 3m Hamilton echelle, and Keck-I HIRES echelle spectrographs. The combined observations demonstrate that AP Col is the closer of only two known systems within 10pc of the Sun younger than 100Myr. Given its space motion and apparent age of 12-50Myr, AP Col is likely a member of the recently proposed ∼ 40Myr old Argus/IC 2391 Association.

KW - astrometry

KW - parallaxes

KW - solar neighborhood

KW - stars: low-mass

KW - stars: pre-main sequence

KW - techniques: spectroscopic

UR - https://www.scopus.com/pages/publications/80054024533

U2 - 10.1088/0004-6256/142/4/104

DO - 10.1088/0004-6256/142/4/104

M3 - Article

SN - 0004-6256

VL - 142

JO - Astronomical Journal

JF - Astronomical Journal

IS - 4

M1 - 104

ER -

The solar neighborhood. XXVI. AP Col: The closest (8.4pc) pre-main-sequence star

Abstract

Access to Document

Other files and links

Fingerprint

Cite this