| Autor: |
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 |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 943, Iss 1, p 49 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/acab04 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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