NGC 1980 is not a foreground population of Orion

Min Fang, Jinyoung Serena Kim, Ilaria Pascucci, Daniel Apai, Lan Zhang, Aurora Sicilia-Aguilar, Miguel Alonso-Martinez, Carlos Eiroa, Hongchi Wang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We perform a spectroscopic survey of the foreground population in Orion A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to derive spectral types, extinction values, and masses for 691 stars. Using the Spitzer Space Telescope data, we characterize the disk properties of these sources. We identify 37 new transition disk (TD) objects, one globally depleted disk candidate, and 7 probable young debris disks. We discover an object with a mass less than 0.018-0.030 M?, which harbors a flaring disk. Using the H? emission line, we characterize the accretion activity of the sources with disks, and confirm that fraction of accreting TDs is lower than that of optically thick disks (46� versus 73�, respectively). Using kinematic data from the Sloan Digital Sky Survey and APOGEE INfrared Spectroscopy of Young Nebulous Clusters program (IN-SYNC), we confirm that the foreground population shows similar kinematics to their local molecular clouds and other young stars in the same regions. Using the isochronal ages, we find that the foreground population has a median age around 1-2 Myr, which is similar to the one of other young stars in Orion A. Therefore, our results argue against the presence of a large and old foreground cluster in front of Orion A.
Original languageEnglish
Number of pages23
JournalAstronomical Journal
Volume153
Issue number4
DOIs
Publication statusPublished - 20 Mar 2017

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kinematics
stars
infrared spectroscopy
Space Infrared Telescope Facility
harbors
harbor
extinction
accretion
molecular clouds
debris
young
flaring
programme

Keywords

  • Accretion, accretion disks
  • Planetary systems: protoplanetary disks
  • Stars: pre-main sequence

Cite this

Fang, M., Kim, J. S., Pascucci, I., Apai, D., Zhang, L., Sicilia-Aguilar, A., ... Wang, H. (2017). NGC 1980 is not a foreground population of Orion. Astronomical Journal, 153(4). https://doi.org/10.3847/1538-3881/aa647b
Fang, Min ; Kim, Jinyoung Serena ; Pascucci, Ilaria ; Apai, Daniel ; Zhang, Lan ; Sicilia-Aguilar, Aurora ; Alonso-Martinez, Miguel ; Eiroa, Carlos ; Wang, Hongchi. / NGC 1980 is not a foreground population of Orion. In: Astronomical Journal. 2017 ; Vol. 153, No. 4.
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Fang, M, Kim, JS, Pascucci, I, Apai, D, Zhang, L, Sicilia-Aguilar, A, Alonso-Martinez, M, Eiroa, C & Wang, H 2017, 'NGC 1980 is not a foreground population of Orion', Astronomical Journal, vol. 153, no. 4. https://doi.org/10.3847/1538-3881/aa647b

NGC 1980 is not a foreground population of Orion. / Fang, Min; Kim, Jinyoung Serena; Pascucci, Ilaria; Apai, Daniel; Zhang, Lan; Sicilia-Aguilar, Aurora; Alonso-Martinez, Miguel; Eiroa, Carlos; Wang, Hongchi.

In: Astronomical Journal, Vol. 153, No. 4, 20.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - NGC 1980 is not a foreground population of Orion

AU - Fang, Min

AU - Kim, Jinyoung Serena

AU - Pascucci, Ilaria

AU - Apai, Daniel

AU - Zhang, Lan

AU - Sicilia-Aguilar, Aurora

AU - Alonso-Martinez, Miguel

AU - Eiroa, Carlos

AU - Wang, Hongchi

PY - 2017/3/20

Y1 - 2017/3/20

N2 - We perform a spectroscopic survey of the foreground population in Orion A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to derive spectral types, extinction values, and masses for 691 stars. Using the Spitzer Space Telescope data, we characterize the disk properties of these sources. We identify 37 new transition disk (TD) objects, one globally depleted disk candidate, and 7 probable young debris disks. We discover an object with a mass less than 0.018-0.030 M?, which harbors a flaring disk. Using the H? emission line, we characterize the accretion activity of the sources with disks, and confirm that fraction of accreting TDs is lower than that of optically thick disks (46� versus 73�, respectively). Using kinematic data from the Sloan Digital Sky Survey and APOGEE INfrared Spectroscopy of Young Nebulous Clusters program (IN-SYNC), we confirm that the foreground population shows similar kinematics to their local molecular clouds and other young stars in the same regions. Using the isochronal ages, we find that the foreground population has a median age around 1-2 Myr, which is similar to the one of other young stars in Orion A. Therefore, our results argue against the presence of a large and old foreground cluster in front of Orion A.

AB - We perform a spectroscopic survey of the foreground population in Orion A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to derive spectral types, extinction values, and masses for 691 stars. Using the Spitzer Space Telescope data, we characterize the disk properties of these sources. We identify 37 new transition disk (TD) objects, one globally depleted disk candidate, and 7 probable young debris disks. We discover an object with a mass less than 0.018-0.030 M?, which harbors a flaring disk. Using the H? emission line, we characterize the accretion activity of the sources with disks, and confirm that fraction of accreting TDs is lower than that of optically thick disks (46� versus 73�, respectively). Using kinematic data from the Sloan Digital Sky Survey and APOGEE INfrared Spectroscopy of Young Nebulous Clusters program (IN-SYNC), we confirm that the foreground population shows similar kinematics to their local molecular clouds and other young stars in the same regions. Using the isochronal ages, we find that the foreground population has a median age around 1-2 Myr, which is similar to the one of other young stars in Orion A. Therefore, our results argue against the presence of a large and old foreground cluster in front of Orion A.

KW - Accretion, accretion disks

KW - Planetary systems: protoplanetary disks

KW - Stars: pre-main sequence

UR - https://arxiv.org/abs/1703.06948

U2 - 10.3847/1538-3881/aa647b

DO - 10.3847/1538-3881/aa647b

M3 - Article

VL - 153

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 4

ER -