Telluric absorption lines in the ALMA spectra of η Car

0569084 - ASÚ 2023 RIV GB eng J - Článek v odborném periodiku
Abraham, Z. … celkem 5 autorů
Telluric absorption lines in the ALMA spectra of η Car.
Monthly Notices of the Royal Astronomical Society. Roč. 517, č. 1 (2022), s. 47-58. ISSN 0035-8711. E-ISSN 1365-2966
Výzkumná infrastruktura: EU-ARC.CZ II - 90106
Klíčová slova: solar astrophysics * stellar astrophysics * atmospheric effects
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 4.8, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1093/mnras/stac2661

In this work, we explore three different sets of ALMA archive data of eta Car, including high resolution (0.065 arcsec x 0.043 arcsec) observations recently published by our group, to verify which of these absorption lines are real and discuss their origin. We conclude that some of them truly originate in clouds close to the binary system, while others are artefacts of a faulty elimination of telluric lines during ALMA calibration procedure. We found that these absorption lines are not present in the phase calibrators because they are much weaker than eta Car, where the absorption line appears because the high intensity continuum enhances the small individual systematic calibration errors.
Trvalý link: https://hdl.handle.net/11104/0340399