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2024ApJ...972....6T - Astrophys. J., 972, 6 (2024/September-1)

Flaring Stars in a Nontargeted Millimeter-wave Survey with SPT-3G.

TANDOI C., GUNS S., FOSTER A., ADE P.A.R., ANDERSON A.J., ANSARINEJAD B., ARCHIPLEY M., BALKENHOL L., BENABED K., BENDER A.N., BENSON B.A., BIANCHINI F., BLEEM L.E., BOUCHET F.R., BRYANT L., CAMPHUIS E., CARLSTROM J.E., CECIL T.W., CHANG C.L., CHAUBAL P., CHICHURA P.M., CHOU T.-L., COERVER A., CRAWFORD T.M., CUKIERMAN A., DALEY C., DE HAAN T., DIBERT K.R., DOBBS M.A., DOUSSOT A., DUTCHER D., EVERETT W., FENG C., FERGUSON K.R., FICHMAN K., GALLI S., GAMBREL A.E., GARDNER R.W., GE F., GOECKNER-WALD N., GUALTIERI R., GUIDI F., HALVERSON N.W., HIVON E., HOLDER G.P., HOLZAPFEL W.L., HOOD J.C., HUANG N., KERUZORE F., KNOX L., KORMAN M., KORNOELJE K., KUO C.-L., LEE A.T., LEVY K., LOWITZ A.E., LU C., MANIYAR A., MENANTEAU F., MILLEA M., MONTGOMERY J., MOON Y., NAKATO Y., NATOLI T., NOBLE G.I., NOVOSAD V., OMORI Y., PADIN S., PAN Z., PASCHOS P., PHADKE K.A., PRABHU K., QU Z., QUAN W., RAHIMI M., RAHLIN A., REICHARDT C.L., REUTER C., ROUBLE M., RUHL J.E., SCHIAPPUCCI E., SMECHER G., SOBRIN J.A., STARK A.A., STEPHEN J., SUZUKI A., THOMPSON K.L., THORNE B., TRENDAFILOVA C., TUCKER C., UMILTA C., VIEIRA J.D., WAN Y., WANG G., WHITEHORN N., WU W.L.K., YEFREMENKO V., YOUNG M.R. and ZEBROWSKI J.A.

Abstract (from CDS):

We present a flare star catalog from 4 yr of nontargeted millimeter-wave survey data from the South Pole Telescope (SPT). The data were taken with the SPT-3G camera and cover a 1500 deg2 region of the sky from 20h40m0s to 3h20m0s in right ascension and from -42° to -70° in declination. This region was observed on a nearly daily cadence from 2019 to 2022 and chosen to avoid the plane of the galaxy. A short-duration transient search of this survey yields 111 flaring events from 66 stars, increasing the number of both flaring events and detected flare stars by an order of magnitude from the previous SPT-3G data release. We provide cross-matching to Gaia DR3, as well as matches to X-ray point sources found in the second ROSAT all-sky survey. We have detected flaring stars across the main sequence, from early-type A stars to M dwarfs, as well as a large population of evolved stars. These stars are mostly nearby, spanning 10-1000 pc in distance. Most of the flare spectral indices are constant or gently rising as a function of frequency at 95/150/220 GHz. The timescale of these events can range from minutes to hours, and the peak νLν luminosities range from 1027 to 1031 erg s–1 in the SPT-3G frequency bands.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Millimeter astronomy - Transient detection - Transient sources - Flare stars - Stellar flares

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 23

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