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| Query : 2021RNAAS...5...73R |
2021RNAAS...5...73R - Research Notes of the AAS, 5, 73 (2021/April-0)
A New Look into K-giants' Chromospheres.
RAU G., PEACOCK S. and CARPENTER K.G.
Abstract (from CDS):
We report the preliminary modeling of archival Center for High Angular Resolution Astronomy (CHARA)/Visible spEctroGraph and polArimeter interferometric data of a K-giant star using the PHOENIX atmosphere code. We find that our preparatory model that includes only the chromospheric contribution closely reproduces the observed infrared Ca II triplet line profiles of a test star: the K-giant, β Cet. This preliminary work requires the additional modeling of the wind contribution to improve the agreement with observations. We plan to perform a systematic study of K-giants chromospheric emission with multi-wavelength and multi-technique observations and modeling. Our plans include extending the modeling work to include the underlying wind component for a larger set of stars. Stellar Parameters and Images with a Cophased Array, the second-generation instrument at CHARA, will be the ideal instrument to perform such observations and reveal the chromospheric activity of K-giants.
Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.
Journal keyword(s): Stellar winds - Stellar mass loss - Evolved stars - Late-type stars - Optical interferometry - K giant stars - Late-type giant stars - Astronomy data modeling - K stars - Giant stars - Interstellar medium - Astronomy data analysis
Simbad objects: 10
| Number of rows : 10 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * bet Cet | PM* | 00 43 35.37090 | -17 59 11.7827 | 3.90 | 3.02 | 2.01 | 1.29 | 0.78 | G9.5IIICH-1 | 543 | 1 |
| 2 | * eta Cet | HB* | 01 08 35.3913324413 | -10 10 56.151936084 | 5.80 | 4.61 | 3.45 | 2.61 | 2.03 | K2-IIIb | 239 | 0 |
| 3 | * bet Gem | PM* | 07 45 18.94987 | +28 01 34.3160 | 3.00 | 2.14 | 1.14 | 0.39 | -0.11 | K0IIIb | 1150 | 2 |
| 4 | * mu. Leo | PM* | 09 52 45.8170136628 | +26 00 25.024269924 | 6.50 | 5.10 | 3.88 | 2.97 | 2.39 | K2IIIbCN1Ca1 | 479 | 0 |
| 5 | * del Crt | PM* | 11 19 20.4473515372 | -14 46 42.743409457 | 5.66 | 4.67 | 3.56 | 2.73 | 2.13 | G9IIICH0.5 | 180 | 0 |
| 6 | * alf Boo | RG* | 14 15 39.67207 | +19 10 56.6730 | 2.46 | 1.18 | -0.05 | -1.03 | -1.68 | K1.5IIIFe-0.5 | 2417 | 1 |
| 7 | * rho Boo | PM* | 14 31 49.7893292450 | +30 22 17.171652275 | 6.33 | 4.89 | 3.59 | 2.67 | 2.02 | K3-III | 270 | 0 |
| 8 | * bet Oph | PM* | 17 43 28.3519097803 | +04 34 02.293206489 | 5.150 | 3.930 | 2.750 | 1.96 | 1.38 | K2IIICN0.5 | 490 | 0 |
| 9 | * 109 Her | ** | 18 23 41.8897062084 | +21 46 11.109609046 | 6.18 | 5.02 | 3.84 | 2.99 | 2.39 | K2IIIab | 187 | 0 |
| 10 | * iot Cep | PM* | 22 49 40.8174918750 | +66 12 01.458192633 | 5.50 | 4.60 | 3.54 | 2.69 | 2.19 | K0-III | 257 | 0 |
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