Matches in SemOpenAlex for { <https://semopenalex.org/work/W3016972969> ?p ?o ?g. }
- W3016972969 endingPage "L23" @default.
- W3016972969 startingPage "L23" @default.
- W3016972969 abstract "In 2019 October Betelgeuse began a decline in V-band brightness that went beyond the minimum expected from its quasi-periodic ~420 day cycle, becoming the faintest in recorded photometric history. Observations obtained in 2019 December with VLT/SPHERE (Montarges 2020) have shown that the southern half of the star has become markedly fainter than in 2019 January indicating that a major change has occurred in, or near, the photosphere. We present SOFIA-EXES high spectral-resolution observations of [Fe II] 25.99 mic and [S I] 25.25 mic emission lines from Betelgeuse obtained during the unprecedented 2020 February V-band brightness minimum to investigate potential changes in the circumstellar flow. These spectra are compared to observations obtained in 2015 and 2017 when the V magnitude was typical of brighter phases. We find only very small changes in the gas velocities reflected by either of the line profiles, no significant changes in the flux to continuum ratios, and hence no significant changes in the [Fe II]/[S I] flux ratios. There is evidence that absorption features have appeared in the 2020 continuum. The Alfven wave-crossing time from the upper-photosphere is sufficiently long that one would not expect a change in the large scale magnetic field to reach the circumstellar [Fe II] and [S I] line forming regions, 3 < R(R*) < 20. However, the light-crossing time is of order a few hours and a reduction in luminosity may reduce the dust-gas heating rate and [O I] 63.19 mic emission which has contributions from R > 20R*, where significant circumstellar oxygen-rich dust is observed." @default.
- W3016972969 created "2020-04-24" @default.
- W3016972969 creator A5000746234 @default.
- W3016972969 creator A5001299234 @default.
- W3016972969 creator A5002798944 @default.
- W3016972969 creator A5004226024 @default.
- W3016972969 creator A5010767493 @default.
- W3016972969 creator A5023977851 @default.
- W3016972969 creator A5029576781 @default.
- W3016972969 creator A5043560677 @default.
- W3016972969 creator A5066796725 @default.
- W3016972969 date "2020-04-14" @default.
- W3016972969 modified "2023-10-12" @default.
- W3016972969 title "SOFIA-EXES Observations of Betelgeuse during the Great Dimming of 2019/2020" @default.
- W3016972969 cites W1641442714 @default.
- W3016972969 cites W1967112628 @default.
- W3016972969 cites W1977344962 @default.
- W3016972969 cites W1979495364 @default.
- W3016972969 cites W1988798572 @default.
- W3016972969 cites W1988806959 @default.
- W3016972969 cites W1991501845 @default.
- W3016972969 cites W1993574117 @default.
- W3016972969 cites W2004815655 @default.
- W3016972969 cites W2006776508 @default.
- W3016972969 cites W2007156045 @default.
- W3016972969 cites W2015718251 @default.
- W3016972969 cites W2023057360 @default.
- W3016972969 cites W2024459670 @default.
- W3016972969 cites W2032998356 @default.
- W3016972969 cites W2037643589 @default.
- W3016972969 cites W2044179485 @default.
- W3016972969 cites W2052672418 @default.
- W3016972969 cites W2058633551 @default.
- W3016972969 cites W2060991303 @default.
- W3016972969 cites W2065500144 @default.
- W3016972969 cites W2065706838 @default.
- W3016972969 cites W2077735567 @default.
- W3016972969 cites W2081635525 @default.
- W3016972969 cites W2085783819 @default.
- W3016972969 cites W2095841346 @default.
- W3016972969 cites W2128791733 @default.
- W3016972969 cites W2135034473 @default.
- W3016972969 cites W2157990947 @default.
- W3016972969 cites W2164503997 @default.
- W3016972969 cites W2170092048 @default.
- W3016972969 cites W2170369796 @default.
- W3016972969 cites W2278821904 @default.
- W3016972969 cites W2586964477 @default.
- W3016972969 cites W2608607038 @default.
- W3016972969 cites W2769541839 @default.
- W3016972969 cites W2795425391 @default.
- W3016972969 cites W2810154278 @default.
- W3016972969 cites W2811453710 @default.
- W3016972969 cites W2898227269 @default.
- W3016972969 cites W2899497983 @default.
- W3016972969 cites W2901586348 @default.
- W3016972969 cites W2942944845 @default.
- W3016972969 cites W3006873617 @default.
- W3016972969 cites W3098851892 @default.
- W3016972969 cites W3099669620 @default.
- W3016972969 cites W3099741247 @default.
- W3016972969 cites W3102585340 @default.
- W3016972969 cites W3103142876 @default.
- W3016972969 cites W3103797533 @default.
- W3016972969 cites W3103904958 @default.
- W3016972969 cites W3121320022 @default.
- W3016972969 cites W4234643764 @default.
- W3016972969 cites W4237914074 @default.
- W3016972969 cites W4291238518 @default.
- W3016972969 cites W4292399985 @default.
- W3016972969 cites W4293088731 @default.
- W3016972969 doi "https://doi.org/10.3847/2041-8213/ab84e6" @default.
- W3016972969 hasPublicationYear "2020" @default.
- W3016972969 type Work @default.
- W3016972969 sameAs 3016972969 @default.
- W3016972969 citedByCount "9" @default.
- W3016972969 countsByYear W30169729692020 @default.
- W3016972969 countsByYear W30169729692021 @default.
- W3016972969 countsByYear W30169729692022 @default.
- W3016972969 countsByYear W30169729692023 @default.
- W3016972969 crossrefType "journal-article" @default.
- W3016972969 hasAuthorship W3016972969A5000746234 @default.
- W3016972969 hasAuthorship W3016972969A5001299234 @default.
- W3016972969 hasAuthorship W3016972969A5002798944 @default.
- W3016972969 hasAuthorship W3016972969A5004226024 @default.
- W3016972969 hasAuthorship W3016972969A5010767493 @default.
- W3016972969 hasAuthorship W3016972969A5023977851 @default.
- W3016972969 hasAuthorship W3016972969A5029576781 @default.
- W3016972969 hasAuthorship W3016972969A5043560677 @default.
- W3016972969 hasAuthorship W3016972969A5066796725 @default.
- W3016972969 hasBestOaLocation W30169729691 @default.
- W3016972969 hasConcept C108884401 @default.
- W3016972969 hasConcept C121332964 @default.
- W3016972969 hasConcept C12287442 @default.
- W3016972969 hasConcept C125245961 @default.
- W3016972969 hasConcept C1276947 @default.
- W3016972969 hasConcept C191897082 @default.
- W3016972969 hasConcept C192562407 @default.