Results 11 to 20 of about 2,279,293 (256)

SuperWASP observations of pulsating Am stars [PDF]

, 2011
We have studied over 1600 Am stars at a photometric precision of 1 mmag with SuperWASP photometric data. Contrary to previous belief, we find that around 200 Am stars are pulsating δ Sct and γ Dor stars, with low amplitudes that have been missed in ...
E. K. Simpson (7603865), D. W. Kurtz (7603823), F. Faedi (7603841), D. J. Christian (7603835), K. Horne (7603850), C. A. Haswell (7603844), P. F. L. Maxted (5577212), P. J. Wheatley (7590065), D. Pollacco (7603205), B. Enoch (7603838), B. Smalley (7602269), T. A. Lister (7603856), L. Fossati (7603826), I. Skillen (7601975), J. Southworth (7603589), O. W. Butters (7603832), A. J. Norton (7603859), P. L. Wood (7603871), A. M. S. Smith (7603586), D. R. Anderson (7602266), S. R. Kane (7603853), A. C. Cameron (7603565), R. G. West (7602272), R. A. Street (7603868), N. Parley (7603862), C. Hellier (7603562), S. C. C. Barros (7603829), S. Holmes (7603847)   +27 more
core   +6 more sources

TESS observations of Am stars

, 2021
The metallic-line (Am) stars are chemically peculiar A and early F stars that show weak spectral lines of Ca K and Sc and strong iron-group features compared to their hydrogen-line spectral type.
Murphy, Simon J., Hey, D. R., Niemczura, Ewa, Smalley, Barry   +3 more
core   +1 more source

Spectroscopic survey of Kepler stars – II. FIES/NOT observations of A- and F-type stars [PDF]

, 2017
We have analysed high-resolution spectra of 28 A and 22 F stars in the Kepler field, observed using the Fibre-Fed Échelle Spectrograph at the Nordic Optical Telescope. We provide spectral types, atmospheric parameters and chemical abundances for 50 stars.
S. J. Murphy, J. M. Lykke, G. Michalska, M. Polińska, Lykke, Julie Maria, B. Smalley, Triviño Hage, A., A. Triviño Hage, Smalley, B., E. Niemczura, K. Uytterhoeven, Uytterhoeven, K., Michalska, G., Polińska, M., J. Jessen-Hansen, Kołaczkowski, Z., Kolaczkowski, Z., Jessen-Hansen, J., Z. Kołaczkowski, Niemczura, E., Murphy, S. J., Lykke, J. M., Smalley   +22 more
core   +2 more sources

Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP [PDF]

, 2017
We present the results of a study of a large sample of A and Am stars with spectral types from LAMOST and light curves from WASP. We find that, unlike normal A stars, δ Sct pulsations in Am stars are mostly confined to the effective temperature range ...
R. Anderson, D., Ripepi, V, Holdsworth, D. L., Cat, P De, West, R. G., Kurtz, D W, Murphy, S. J., Maxted, P. F. L., G. West, R., Maxted, P F L, Norton, A. J., Antoci, V, J. Murphy, S., Catanzaro, G, W. Kurtz, D., RIPEPI, Vincenzo, Pollacco, D, Murphy, S J, Pollacco, D., L. Holdsworth, D., Antoci, V., J. Wheatley, P., Kurtz, D. W., CATANZARO, Giovanni, Hellier, C., Anderson, D R, F. L. Maxted, P., Smalley, B, Smalley, B., J. Norton, A., Hellier, C, De Cat, P., Collier Cameron, A., Holdsworth, Daniel Luke, Collier Cameron, A, Norton, A J, Catanzaro, G., Wheatley, P. J., Ripepi, V., Anderson, D. R., Collier Cameron, A. ; id_orcid   +40 more
core   +1 more source

Are Am stars and hot-Jupiter planets related?

, 2022
Context. Metallic-lined A stars (Am stars) are often components of short-period binary systems, where tidal interactions would result in low rotational velocities and help to develop the chemical peculiarities observed.
E. Jofré, F. Gunella, J. Alacoria, M. Jaque Arancibia, C. Saffe, E. Martioli, M. Flores, A. Collado, P. Miquelarena, R. Angeloni, R. Petrucci, Jaque Arancibia, Marcelo Daniel, Jofre, E., Collado, A., Alacoria, José Alberto, Petrucci, Romina Paola, Gunella, F., Saffe, Carlos, Arancibia, M. Jaque, Saffe, C., Alacoria, J., Miquelarena Hollger, Paula Andrea, Flores Trivigno, Matias Gaston, Petrucci, R., Miquelarena, P., Flores, M., Collado, Ana Elisa, Martioli, E., Angeloni, R., Gunella Toledo, Jose Fernando   +29 more
core   +1 more source

Hubble space telescope parallaxes of AM CVn stars and astrophysical consequences [PDF]

, 2007
We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our parallax measurements translate into distances dAM CVn = 606(-93)(+135) pc, d(HP)
Roelofs, Gijs H. A., Benedict, G.F., Morales-Rueda, L., Benedict, G. F., Steeghs, D., Roelofs, G.H.A., McArthur, B.E., Nelemans, G., Marsh, T.R., Nelemans, G.A., Groot, P. J., McArthur, B. E., Marsh, T. R., Groot, P.J.   +13 more
core   +1 more source

Probing the composition of sub-millisecond rotating compact stars by r-modes instability [PDF]

, 2012
We investigate the implications of the r-modes instability on the composition of a compact star rotating at a sub-millisecond period. In particular, the only viable astrophysical scenario for such an object, wich might present inside the Low Mass X-ray ...
Giuseppe Pagliara, Drago, Alessandro, Alessandro Drago, Pagliara, Giuseppe   +3 more
core   +1 more source

Gravitoastronomy with neutron stars [PDF]

, 2004
Recent advances in gravitational wave detectors mean that we can start to make astrophysically important statements about the physics of neutron stars based on observed upper limits to their gravitational luminosity.
Woan, G., Graham Woan
core   +1 more source

Dynamical He Flashes in Double White Dwarf Binaries

The Astrophysical Journal, 2023
The detonation of an overlying helium layer on a 0.8–1.1 M _⊙ carbon–oxygen (CO) white dwarf (WD) can detonate the CO WD and create a thermonuclear supernova (SN).
Tin Long Sunny Wong, Lars Bildsten
doaj   +1 more source

Angular momentum transport through the baroclinic instability in intermediate-mass stars

Astronomy & Astrophysics
Context. Models of rotating stars in which the transport of angular momentum (AM) is only driven by the shear instability and the meridional circulation tend to overestimate the internal degree of radial differential rotation, when compared to ...
Marchand M., Eggenberger P., Moyano F. D., Rodriguez C., Sciarini L., Saio H.   +5 more
doaj   +1 more source