Results 1 to 10 of about 504,055 (282)

Gaia Radial Velocity Spectrometer [PDF]

, 2018
19 pages, 20 figures.
Cropper, M, Katz, D, Sartoretti, P, Prusti, T, de Bruijne, JHJ, Chassat, F, Charvet, P, Boyadjian, J, Perryman, M, Sarri, G, Gare, P, Erdmann, M, Munari, U, Zwitter, T, Wilkinson, M, Arenou, F, Vallenari, A, Gomez, A, Panuzzo, P, Seabroke, G, Allende Prieto, C, Benson, K, Marchal, O, Huckle, H, Smith, M, Dolding, C, Janssen, K, Viala, Y, Blomme, R, Baker, S, Boudreault, S, Crifo, F, Soubiran, C, Fremat, Y, Jasniewicz, G, Guerrier, A, Guy, LP, Turon, C, Jean-Antoine-Piccolo, A, Thevenin, F, David, M, Gosset, E, Damerdji, Y   +42 more
openaire   +3 more sources

Starspot-induced optical and infrared radial velocity variability in T Tauri star Hubble 4 [PDF]

, 2011
We report optical (6150 Ang) and K-band (2.3 micron) radial velocities obtained over two years for the pre-main sequence weak-lined T Tauri star Hubble I 4.
Bean, Blake, Charles A. Beichman, Christopher J. Crockett, Christopher M. Johns-Krull, Covey, Crockett, Cumming, Daniel T. Jaffe, Endl, Furlan, Hatzes, Herbig, Huerta, Johns-Krull, Johns-Krull, Johns-Krull, Joncour, Kraus, L. Prato, Mahmud, Mahmud, Marcy, Martín, Naved I. Mahmud, Nidever, Patrick M. Hartigan, Paulson, Prato, Reiners, Saar, Saar, Setiawan, West, White, Wright   +35 more
core   +2 more sources

Photometry as a proxy for stellar activity in radial velocity analyses

, 2020
Stellar activity remains a limiting factor in measuring precise planet parameters from radial velocity spectroscopy, not least in the search for Earth mass planets orbiting in the habitable zones of Sun-like stars.
Crossfield, Ian J. M., Kosiarek, Molly R.   +1 more
core   +1 more source

Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity

, 2015
We investigate the nature of the long-period radial velocity variations in Alpha Tau first reported over 20 years ago. We analyzed precise stellar radial velocity measurements for Alpha Tau spanning over 30 years.
Cochran, W. D., Doellinger, M., Endl, M., Girardi, L., Guenther, E. W., Han, I., Hartmann, M., Hatzes, A. P., Kim, K. -M., Larson, A. M., Lee, B. -C., MacQueen, P., Mkrtichian, D. E., Simon, A. E., Walker, G. A. H., Yang, S., Zechmeister, M.   +16 more
core   +1 more source

Velocity effects on second order contributions to gravitational frequency shift by a moving Kerr–Newman black hole

European Physical Journal C: Particles and Fields, 2019
The significance of the radial velocity effects on the leading-order gravitational frequency shift in some special cases was reported recently. This paper investigates the gravitational shift of frequency of light propagating in the equatorial plane of a
Guansheng He, Chaohong Pan, Wenbin Lin
doaj   +1 more source

Effect of Radial Porosity Oscillation on the Thermal Performance of Packed Bed Latent Heat Storage

Engineering, 2021
Owing to its high heat storage capacity and fast heat transfer rate, packed bed latent heat storage (LHS) is considered as a promising method to store thermal energy.
H.B. Liu, C.Y. Zhao
doaj   +1 more source

The Open Cluster NGC 7789: I. Radial Velocities for Giant Stars

, 1998
A total of 597 radial-velocity observations for 112 stars in the ~1.6 Gyr old open cluster NGC 7789 have been obtained since 1979 with the radial velocity spectrometer at the Dominion Astrophysical Observatory. The mean cluster radial velocity is -54.9 +/
Carraro G., James E.  Hesser, Jennens P. A., McNamara B. J., Mermilliod J.-C., Mermilliod J.-C., Mermilliod J.-C., Mermilliod J.-C., Mermilliod J.-C., Munhwan  Gim, Peter B.  Stetson, Raboud D., Robert D.  McClure   +12 more
core   +1 more source

Propagation velocities of gas rings in collisional ring galaxies [PDF]

, 2003
The propagation velocity of the first gas ring in collisional ring galaxies, i.e. the velocity at which the maximum in the radial gas density profile propagates radially in the galactic disk, is usually inferred from the radial expansion velocity of gas ...
Amram, Appleton, Appleton, Appleton, Athanassoula, Bahcall, Bohlin, Bransford, Combes, Condon, Davies, Faber, Fosbury, Hernquist, Higdon, Higdon, Horellou, Horellou, Korchagin, Korchagin, Kurucz, Leitherer, Lejeune, Marcum, Marston, Martin, Mayya, Mayya, Mihos, Olson, Reshetnikov, Schaller, Stone, Struck, Tsuchiya, Vorobyov   +35 more
core   +2 more sources

CEPHEID PULSATIONS FROM RADIAL VELOCITY MEASUREMENTS

Odessa Astronomical Publications, 2017
We discuss the results of our many-year program of Cepheid radial velocities concerning the Hertzsprung sequence in radial-velocity curves, double-mode Cepheids, the period-radius relation, binary Cepheids.
N. A. Gorynya, N. N. Samus
doaj   +1 more source

The Death of Vulcan: NEID Reveals That the Planet Candidate Orbiting HD 26965 Is Stellar Activity

The Astronomical Journal
We revisit the long-studied radial velocity (RV) target HD 26965 using recent observations from the NASA-NSF “NEID” precision Doppler facility. Leveraging a suite of classical activity indicators, combined with line-by-line RV analyses, we demonstrate ...
Abigail Burrows, Samuel Halverson, Jared C. Siegel, Christian Gilbertson, Jacob Luhn, Jennifer Burt, Chad F. Bender, Arpita Roy, Ryan C. Terrien, Selma Vangstein, Suvrath Mahadevan, Jason T. Wright, Paul Robertson, Eric B. Ford, Gumundur Stefánsson, Joe P. Ninan, Cullen H. Blake, Michael W. McElwain, Christian Schwab, Jinglin Zhao   +19 more
doaj   +1 more source