The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius
We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in the Ophiuchus and Upper Scorpius star-forming regions. We employed synthetic spectra and a Markov chain Monte Carlo approach to fit specific K...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acab04 |
| _version_ | 1797695820444729344 |
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| author | Ricardo López-Valdivia Gregory N. Mace Eunkyu Han Erica Sawczynec Jesús Hernández L. Prato Christopher M. Johns-Krull Heeyoung Oh Jae-Joon Lee Adam Kraus Joe Llama Daniel T. Jaffe |
| author_facet | Ricardo López-Valdivia Gregory N. Mace Eunkyu Han Erica Sawczynec Jesús Hernández L. Prato Christopher M. Johns-Krull Heeyoung Oh Jae-Joon Lee Adam Kraus Joe Llama Daniel T. Jaffe |
| author_sort | Ricardo López-Valdivia |
| collection | DOAJ |
| description | We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in the Ophiuchus and Upper Scorpius star-forming regions. We employed synthetic spectra and a Markov chain Monte Carlo approach to fit specific K -band spectral regions and determine the photospheric temperature ( T ), surface gravity ( $\mathrm{log}g$ ), magnetic field strength ( B ), projected rotational velocity ( $v\sin i$ ), and K -band veiling ( r _K ). We determined B for ∼46% of our sample. Stellar parameters were compared to the results from Taurus-Auriga and the TW Hydrae association presented in Paper I of this series. We classified all the YSOs in the IGRINS survey with infrared spectral indices from Two Micron All Sky Survey and Wide-field Infrared Survey Explorer photometry between 2 and 24 μ m. We found that Class II YSOs typically have lower $\mathrm{log}g$ and $v\sin i$ , similar B , and higher K -band veiling than their Class III counterparts. Additionally, we determined the stellar parameters for a sample of K and M field stars also observed with IGRINS. We have identified intrinsic similarities and differences at different evolutionary stages with our homogeneous determination of stellar parameters in the IGRINS YSO survey. Considering $\mathrm{log}g$ as a proxy for age, we found that the Ophiuchus and Taurus samples have a similar age. We also find that Upper Scorpius and TWA YSOs have similar ages, and are more evolved than Ophiuchus/Taurus YSOs. |
| first_indexed | 2024-03-12T03:16:43Z |
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| id | doaj.art-1fe4f2b036ed4f778c2fd49278705e0e |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:16:43Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj.art-1fe4f2b036ed4f778c2fd49278705e0e2023-09-03T14:08:24ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194314910.3847/1538-4357/acab04The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper ScorpiusRicardo López-Valdivia0https://orcid.org/0000-0002-7795-0018Gregory N. Mace1https://orcid.org/0000-0001-7875-6391Eunkyu Han2https://orcid.org/0000-0001-9797-0019Erica Sawczynec3https://orcid.org/0000-0002-8378-1062Jesús Hernández4https://orcid.org/0000-0001-9797-5661L. Prato5https://orcid.org/0000-0001-7998-226XChristopher M. Johns-Krull6https://orcid.org/0000-0002-8828-6386Heeyoung Oh7https://orcid.org/0000-0002-0418-5335Jae-Joon Lee8https://orcid.org/0000-0003-0894-7824Adam Kraus9https://orcid.org/0000-0001-9811-568XJoe Llama10https://orcid.org/0000-0003-4450-0368Daniel T. Jaffe11https://orcid.org/0000-0003-3577-3540The University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mx; Universidad Nacional Autónoma de México , Instituto de Astronomía, AP 106, Ensenada 22800, BC, MéxicoThe University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mxThe University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mxThe University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mxUniversidad Nacional Autónoma de México , Instituto de Astronomía, AP 106, Ensenada 22800, BC, MéxicoLowell Observatory , 1400 W. Mars Hill Road, Flagstaff. AZ 86001, USAPhysics & Astronomy Department, Rice University , 6100 Main Street, Houston, TX 77005, USAKorea Astronomy and Space Science Institute , 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of KoreaKorea Astronomy and Space Science Institute , 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of KoreaThe University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mxLowell Observatory , 1400 W. Mars Hill Road, Flagstaff. AZ 86001, USAThe University of Texas at Austin , Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA ; rlopezv@astro.unam.mxWe used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in the Ophiuchus and Upper Scorpius star-forming regions. We employed synthetic spectra and a Markov chain Monte Carlo approach to fit specific K -band spectral regions and determine the photospheric temperature ( T ), surface gravity ( $\mathrm{log}g$ ), magnetic field strength ( B ), projected rotational velocity ( $v\sin i$ ), and K -band veiling ( r _K ). We determined B for ∼46% of our sample. Stellar parameters were compared to the results from Taurus-Auriga and the TW Hydrae association presented in Paper I of this series. We classified all the YSOs in the IGRINS survey with infrared spectral indices from Two Micron All Sky Survey and Wide-field Infrared Survey Explorer photometry between 2 and 24 μ m. We found that Class II YSOs typically have lower $\mathrm{log}g$ and $v\sin i$ , similar B , and higher K -band veiling than their Class III counterparts. Additionally, we determined the stellar parameters for a sample of K and M field stars also observed with IGRINS. We have identified intrinsic similarities and differences at different evolutionary stages with our homogeneous determination of stellar parameters in the IGRINS YSO survey. Considering $\mathrm{log}g$ as a proxy for age, we found that the Ophiuchus and Taurus samples have a similar age. We also find that Upper Scorpius and TWA YSOs have similar ages, and are more evolved than Ophiuchus/Taurus YSOs.https://doi.org/10.3847/1538-4357/acab04Fundamental parameters of starsInfrared sourcesPre-main sequence starsHigh resolution spectroscopy |
| spellingShingle | Ricardo López-Valdivia Gregory N. Mace Eunkyu Han Erica Sawczynec Jesús Hernández L. Prato Christopher M. Johns-Krull Heeyoung Oh Jae-Joon Lee Adam Kraus Joe Llama Daniel T. Jaffe The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius The Astrophysical Journal Fundamental parameters of stars Infrared sources Pre-main sequence stars High resolution spectroscopy |
| title | The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius |
| title_full | The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius |
| title_fullStr | The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius |
| title_full_unstemmed | The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius |
| title_short | The IGRINS YSO Survey. III. Stellar Parameters of Pre-main-sequence Stars in Ophiuchus and Upper Scorpius |
| title_sort | igrins yso survey iii stellar parameters of pre main sequence stars in ophiuchus and upper scorpius |
| topic | Fundamental parameters of stars Infrared sources Pre-main sequence stars High resolution spectroscopy |
| url | https://doi.org/10.3847/1538-4357/acab04 |
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