Results 41 to 50 of about 313,257 (304)

Measuring the Mass–Radius Relation of White Dwarfs Using Wide Binaries

The Astrophysical Journal
Measuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 135 white ...
Stefan Arseneau, Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska, Gautham Adamane Pallathadka, Nicole R. Crumpler, J. J. Hermes, Kareem El-Badry, Hans-Walter Rix, Keivan G. Stassun, Boris T. Gänsicke, Joel R. Brownstein, Sean Morrison   +12 more
doaj   +1 more source

Seismic Cartography of White-Dwarf Interiors From the Toulouse-Montréal Optimal-Design Approach

Frontiers in Astronomy and Space Sciences, 2022
Probing internal properties of white-dwarf stars has been amongst the earliest objectives of asteroseismology, following the first discovery in the late 1960s of non-radial pulsations in these evolved compact stars.
Noemi Giammichele, Stéphane Charpinet, Pierre Brassard   +2 more
doaj   +1 more source

The Stellar Space Distributions of dA and gK Stars [PDF]

International Astronomical Union Colloquium, 1995
AbstractWe present a case study on the stellar space distribution of stars with MK spectral types B8 to A2 (dA) and gG8 to gK2 (gK) in a sky region of 25 square degrees, centred at the galactic coordinate l = 4° and b = +12°. Two hundred and forty-eight (248) stars with MK type of B8–A2 and gG8–gK2 were identified in this field.
D. N. Dawanas, B. Hidayat
openaire   +1 more source

Initial-Final Mass Relationship for Stars of Different Metallicities

, 2008
Following Paczy\'{n}ski & Zi\'{o}lkowski (1968) and Han et al. (1994), we assume that the envelope of an asymptotic giant branch (AGB) or a first giant branch (FGB) star is lost when the binding energy of the envelope is equal to zero ($\Delta W=0$) and ...
Alcock, Alexander, Arnett, Bedin, Blöcker, Branch, Branch, Busso, Buzzoni, Cappellaro, Cassisi, Chaboyer, Chabrier, Chen, Claver, Dobbie, Dominguez, Eggleton, Eggleton, Eggleton, Eisenstein, Ferrario, Finley, Fontaine, Forestini, Gates, Gesicki, Girardi, Gratton, Groenewegen, Hachisu, Hachisu, Hachisu, Hachisu, Hamuy, Han, Han, Han, Hansen, Herwig, Hillebrandt, Hurley, Hurley, Iben, Iben, Iglesias, Ihara, Judge, Kalirai, Kalirai, Kalirai, Kawka, Kepler, Kilic, Kilic, Kilic, Koester, Langer, Leibundgut, Li, Liebert, Liebert, Luck, Marigo, Mathews, Meng, Miller, Moehler, Origlia, Paczynski, Perlmutter, Perryman, Peterson, Phillips, Pols, Pols, Pols, Prada Moroni, Prada Moroni, Reid, Reid, Riess, Roberts, Ruiz-Lapuente, Ruiz-Lapuente, Salpeter, Schmidt, Schröder, Shanks, Stetson, Straniero, Terlevich, Timmes, Timmes, Travaglio, Umeda, Valenti, van Kerkwijk, Wang, Webbink, Weidemann, Weidemann, Weidemann, Whelan, Williams, Willson, X. Chen, X. Meng, Yungelson, Z. Han   +109 more
core   +1 more source

A Gravitational Redshift Determination of the Mean Mass of White Dwarfs. DA Stars [PDF]

, 2010
We measure apparent velocities (v_app) of the Halpha and Hbeta Balmer line cores for 449 non-binary thin disk normal DA white dwarfs (WDs) using optical spectra taken for the ESO SN Ia Progenitor surveY (SPY; Napiwotzki et al. 2001).
Bergeron, Bischoff-Kim, Chandrasekhar, D. E. Winget, DeGennaro, Engelbrecht, Finley, Finley, Fontaine, Hagen, Homeier, Jordan, Kerr, Kilic, Kilkenny, Koester, Koester, Kuijken, Kurtis A. Williams, Lamontagne, Liebert, M. H. Montgomery, McCook, Mestel, Montgomery, Napiwotzki, Napiwotzki, Richter, Ross E. Falcon, Silvestri, Sion, Tremblay, Tremblay, Vennes, Weidemann, Williams, Winget, Wisotzki, York   +38 more
core   +2 more sources

Carcinomas and Carcinoid Tumors of the Lungs and Bronchi in Children and Adolescents: The EXPeRT Recommendations

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Primary lung carcinomas and bronchial carcinoid tumors (BC) are very rare malignancies in childhood. While typical BC and mucoepidermoid carcinomas are mostly low‐grade, localized tumors with a more favorable prognosis than in adults, necessitating avoidance of overtreatment, adenocarcinomas of the lung are often diagnosed at advanced disease ...
Michael Abele, Calogero Virgone, Michaela Kuhlen, Sabine Irtan, Yves Reguerre, Malgorzata Krawczyk, Ewa Bien, Tal Ben‐Ami, Maja Cesen, Ricardo Lopez‐Almaraz, Andrea Ferrari, Gianni Bisogno, Dominik T. Schneider, Abbas Agaimy, Constantin Lapa, Hubert Ducou le Pointe, Rainer Claus, Catherine Daniel, Ines B. Brecht, Daniel Orbach   +19 more
wiley   +1 more source

A Detailed Model Atmosphere Analysis of Hot White Dwarfs in DESI DR1

The Astrophysical Journal
We present a detailed model atmosphere analysis of hot white dwarfs in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1. Our sample includes 19,321 unique targets with G _BP  −  G _RP ≤ 0.
Mukremin Kilic, Pierre Bergeron, Adam Moss, Simon Blouin, Matthew J. Green, Gracyn Jewett, Manuel Barrientos, Alexander L. Albright, Warren R. Brown   +8 more
doaj   +1 more source

Rare White dwarf stars with carbon atmospheres

, 2007
White dwarfs represent the endpoint of stellar evolution for stars with initial masses between approximately 0.07 msun and 8-10 msun, where msun is the mass of the Sun (more massive stars end their life as either black holes or neutron stars). The theory
Behara, N., Dufour, P., Fontaine, G., Liebert, James   +3 more
core   +2 more sources

Results of the Childhood Cancer and Leukaemia Group's United Kingdom Relapsed Wilms Tumour Trial

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background The United Kingdom relapsed Wilms tumour (UKW‐R) trial aimed to improve the historically low survival rates after relapse of Wilms tumour (WT) through a prospective national risk‐stratified protocol. The trial also evaluated efficacy and toxicity of high‐dose melphalan.
Sucheta J. Vaidya, Veronica Moroz, Juliet Hale, Vesna Pavasovic, Rachel Hobson, Patricia Sartori, Daniel Saunders, Mark Powis, Gordan M. Vujanic, Stephen Baker, Kathy Pritchard‐Jones   +10 more
wiley   +1 more source

Zeros dos Polinômios Característicos dos Métodos BDF

Trends in Computational and Applied Mathematics, 2007
O estudo da estabilidade de métodos numéricos possui um grande potencial em pesquisa. Como a análise da estabilidade está relacionada aos zeros do polinômio característico do método, é importante determinar o comportamento de tais zeros.
M. Meneguette Jr., V.A. Botta
doaj   +1 more source