2024ApJ...975..147H

Query : 2024ApJ...975..147H

2024ApJ...975..147H - Astrophys. J., 975, 147 (2024/November-1)

Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS.

HON M., HUBER D., LI Y., METCALFE T.S., BEDDING T.R., ONG J., CHONTOS A., RUBENZAHL R., HALVERSON S., GARCIA R.A., KJELDSEN H., STELLO D., HEY D.R., CAMPANTE T., HOWARD A.W., GIBSON S.R., RIDER K., ROY A., BAKER A.D., EDELSTEIN J., SMITH C., FULTON B.J., WALAWENDER J., BRODHEIM M., BROWN M., CHAN D., DAI F., DEICH W., GOTTSCHALK C., GRILLO J., HALE D., HILL G.M., HOLDEN B., HOUSEHOLDER A., ISAACSON H., ISHIKAWA Y., JELINSKY S.R., KASSIS M., KAYE S., LAHER R., LANCLOS K., LEE C.-H., LILLEY S., McCARNEY B., MILLER T.N., PAYNE J., PETIGURA E.A., POPPETT C., RAFFANTI M., ROCKOSI C., SANFORD D., SCHWAB C., SHAUM A.P., SIRK M.M., SMITH R., THORNE J., VALLIANT J., VANDENBERG A., WANG S.Y., WISHNOW E., WOLD T., YEH S., BAKER A., BASU S., BEDELL M., CEGLA H.M., CROSSFIELD I., DRESSING C., DUMUSQUE X., KNUTSON H., MAWET D., O'MEARA J., STEFANSSON G., TESKE J., VASISHT G., WANG S.X., WEISS L.M., WINN J.N. and WRIGHT J.T.

Abstract (from CDS):

Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales (${\nu }_{\max }\sim 4300$μHz) in the nearby K dwarf σ Draconis using extreme-precision Doppler velocity observations from the Keck Planet Finder and 20 s cadence photometry from NASA's Transiting Exoplanet Survey Satellite. The star is the coolest dwarf star to date with both velocity and luminosity observations of solar-like oscillations, having amplitudes of 5.9 ± 0.8 cm s–1 and 0.8 ± 0.2 ppm, respectively. These measured values are in excellent agreement with established luminosity-velocity amplitude relations for oscillations and provide further evidence that mode amplitudes for stars with Teff < 5500 K diminish in scale following an (L/M)1.5 relation. By modeling the star's oscillation frequencies from photometric data, we measure an asteroseismic age of 4.5 ± 0.9 (ran) ± 1.2 (sys) Gyr. The observations demonstrate the capability of next-generation spectrographs and precise space-based photometry to extend observational asteroseismology to nearby cool dwarfs, which are benchmarks for stellar astrophysics and prime targets for directly imaging planets using future space-based telescopes.

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

Journal keyword(s): Asteroseismology - Radial velocity - Stellar oscillations - K dwarf stars

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

Simbad objects: 18

goto Full paper

goto View the references in ADS

Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * zet Tuc PM* 00 20 04.2586334956 -64 52 29.257190108 4.82 4.80 4.23 3.73 3.40 F9.5V 415 0
2 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1354 1
3 * lam02 For PM* 02 36 58.6077493776 -34 34 40.711246464 6.67 6.45 5.79     G1V 236 1
4 * pi. Men PM* 05 37 09.8868446714 -80 28 08.834553264   6.25 5.67     G0V 390 1
5 * alf Men PM* 06 10 14.4725823672 -74 45 10.958331816   5.798 5.069     G7V 306 0
6 HD 102365 PM* 11 46 31.0725331317 -40 30 01.285867174 5.65 5.55 4.88 4.35 3.97 G2V 378 1
7 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1352 1
8 * lam Ser PM* 15 46 26.6142121632 +07 21 11.047378824 5.13 5.03 4.42 3.92 3.60 G0-V 618 0
9 * rho CrB PM* 16 01 02.6604891411 +33 18 12.639472357   6.01   5.0   G0+VaFe-1 686 1
10 * 18 Sco PM* 16 15 37.2702755653 -08 22 09.982125430   6.15 5.50     G2Va 671 0
11 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 578 2
12 * 70 Oph A SB* 18 05 27.2484131991 +02 30 00.526614953       3.6   K0V 252 0
13 BD+41 3306 PM* 19 19 00.5489000285 +41 38 04.582441681 10.01 9.67 8.86 8.18 7.66 K0V 331 0
14 * sig Dra PM* 19 32 21.5902098601 +69 39 40.235805206 5.860 5.460 4.680 4.04 3.63 K0V 691 0
15 HD 186306 Em* 19 41 45.6454247760 +43 44 51.716276232   8.70 7.96     G9V 75 0
16 * 16 Cyg ** 19 41 49.09 +50 31 31.6           ~ 166 0
17 * gam Pav PM* 21 26 26.6049826473 -65 21 58.313057521 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 439 0
18 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 616 0

To bookmark this query, right click on this link: simbad:objects in 2024ApJ...975..147H and select 'bookmark this link' or equivalent in the popup menu