Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS
About 22,000 Kepler stars, 7,000 K2 stars, and nearly 60,000 TESS stars from sectors 1–24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods in their light curves consistent with the expected rotation periods. A previous analy...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2021-03-01
|
| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2021.580907/full |
| _version_ | 1818615050036838400 |
|---|---|
| author | Luis A. Balona |
| author_facet | Luis A. Balona |
| author_sort | Luis A. Balona |
| collection | DOAJ |
| description | About 22,000 Kepler stars, 7,000 K2 stars, and nearly 60,000 TESS stars from sectors 1–24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods in their light curves consistent with the expected rotation periods. A previous analysis of A- and late B-type stars suggests that these stars are indeed rotational variables. In this paper we have accumulated data to show that rotational modulation is present in about 30–40% of A- and B-type stars. A search for flares in TESS A- and B-type stars resulted in the detection of 102 flares in 57 stars. Analysis of flare energies show that the source of the flares cannot be a cool dwarf companion nor a F/G giant. The realization that a considerable fraction of A- and B-type stars are active indicates that a revision of current concepts regarding hot star envelopes is required. |
| first_indexed | 2024-12-16T16:27:44Z |
| format | Article |
| id | doaj.art-1b389247928d4b65a9ee3b1ea17a00a6 |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-12-16T16:27:44Z |
| publishDate | 2021-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-1b389247928d4b65a9ee3b1ea17a00a62022-12-21T22:24:42ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2021-03-01810.3389/fspas.2021.580907580907Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESSLuis A. BalonaAbout 22,000 Kepler stars, 7,000 K2 stars, and nearly 60,000 TESS stars from sectors 1–24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods in their light curves consistent with the expected rotation periods. A previous analysis of A- and late B-type stars suggests that these stars are indeed rotational variables. In this paper we have accumulated data to show that rotational modulation is present in about 30–40% of A- and B-type stars. A search for flares in TESS A- and B-type stars resulted in the detection of 102 flares in 57 stars. Analysis of flare energies show that the source of the flares cannot be a cool dwarf companion nor a F/G giant. The realization that a considerable fraction of A- and B-type stars are active indicates that a revision of current concepts regarding hot star envelopes is required.https://www.frontiersin.org/articles/10.3389/fspas.2021.580907/fullstellar activitystellar rotationstar spotsflare starstime series |
| spellingShingle | Luis A. Balona Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS Frontiers in Astronomy and Space Sciences stellar activity stellar rotation star spots flare stars time series |
| title | Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS |
| title_full | Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS |
| title_fullStr | Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS |
| title_full_unstemmed | Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS |
| title_short | Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS |
| title_sort | spots and flares in hot main sequence stars observed by kepler k2 and tess |
| topic | stellar activity stellar rotation star spots flare stars time series |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2021.580907/full |
| work_keys_str_mv | AT luisabalona spotsandflaresinhotmainsequencestarsobservedbykeplerk2andtess |