Anomalous Fe II Spectral Effects and High H I Lyα Temperature in Gas Blobs Near η Carinae
(2004) In Astronomy Letters 30(1). p.58-63- Abstract
- We consider the origin of the anomalously high intensity of theultraviolet Fe II lambda 2507/2509 A lines observed with high spatialand spectral resolutions from gas blobs (GBs) near Carinae. This rareeffect in stellar spectra is attributable to a combination of severalfactors: (1) the high hydrogen density (>10^{8} cm^{-3}) that ensuresthe blocking of the Lyman continuum by GBs and, accordingly, theformation of a cold H I region with completely ionized Fe atoms; (2) thesmall distance between the GBs and the central star that ensures a high(>8000-10 000 K) Ly_alpha H spectral temperature, which photoexcitesFe II selectively; and (3) the population of Fe II levels and,accordingly, the opening of a stimulated emission channel,... (More)
- We consider the origin of the anomalously high intensity of theultraviolet Fe II lambda 2507/2509 A lines observed with high spatialand spectral resolutions from gas blobs (GBs) near Carinae. This rareeffect in stellar spectra is attributable to a combination of severalfactors: (1) the high hydrogen density (>10^{8} cm^{-3}) that ensuresthe blocking of the Lyman continuum by GBs and, accordingly, theformation of a cold H I region with completely ionized Fe atoms; (2) thesmall distance between the GBs and the central star that ensures a high(>8000-10 000 K) Ly_alpha H spectral temperature, which photoexcitesFe II selectively; and (3) the population of Fe II levels and,accordingly, the opening of a stimulated emission channel, whichtogether with spontaneous transitions creates a radiative cycle where asingle Fe II ion can multiply absorb Ly_alpha emission. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/129645
- author
- Johansson, Sveneric LU and Letokhov, Vladilen LU
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astronomy Letters
- volume
- 30
- issue
- 1
- pages
- 58 - 63
- publisher
- MAIK Nauka/Interperiodica
- external identifiers
-
- wos:000188764900006
- scopus:1442355279
- ISSN
- 1063-7737
- DOI
- 10.1134/1.1647477
- language
- English
- LU publication?
- yes
- id
- d52b9e62-74df-4922-a8ce-ece7858030e7 (old id 129645)
- date added to LUP
- 2016-04-01 12:01:45
- date last changed
- 2024-04-23 01:07:26
@article{d52b9e62-74df-4922-a8ce-ece7858030e7,
abstract = {{We consider the origin of the anomalously high intensity of theultraviolet Fe II lambda 2507/2509 A lines observed with high spatialand spectral resolutions from gas blobs (GBs) near Carinae. This rareeffect in stellar spectra is attributable to a combination of severalfactors: (1) the high hydrogen density (>10^{8} cm^{-3}) that ensuresthe blocking of the Lyman continuum by GBs and, accordingly, theformation of a cold H I region with completely ionized Fe atoms; (2) thesmall distance between the GBs and the central star that ensures a high(>8000-10 000 K) Ly_alpha H spectral temperature, which photoexcitesFe II selectively; and (3) the population of Fe II levels and,accordingly, the opening of a stimulated emission channel, whichtogether with spontaneous transitions creates a radiative cycle where asingle Fe II ion can multiply absorb Ly_alpha emission.}},
author = {{Johansson, Sveneric and Letokhov, Vladilen}},
issn = {{1063-7737}},
language = {{eng}},
number = {{1}},
pages = {{58--63}},
publisher = {{MAIK Nauka/Interperiodica}},
series = {{Astronomy Letters}},
title = {{Anomalous Fe II Spectral Effects and High H I Lyα Temperature in Gas Blobs Near η Carinae}},
url = {{https://lup.lub.lu.se/search/files/2750164/624110.pdf}},
doi = {{10.1134/1.1647477}},
volume = {{30}},
year = {{2004}},
}