| Full text | |
| Author(s): Show less - |
Richardson, Noel D.
[1]
;
Thizy, Olivier
[2]
;
Bjorkman, Jon E.
[3]
;
Carciofi, Alex
[4]
;
Rubio, Amanda C.
[4]
;
Thomas, Joshua D.
[5]
;
Bjorkman, Karen S.
[3]
;
Labadie-Bartz, Jonathan
[4]
;
Genaro, Matheus
[4]
;
Wisniewski, John P.
[6]
;
Wang, Luqian
[7, 8]
;
Gies, Douglas R.
[7, 8]
;
Chojnowski, S. Drew
[9, 10]
;
Daly, Andrea
[1]
;
Edwards, Thompson
[5]
;
Fowler, Carlie
[5]
;
Gullingsrud, Allison D.
[3]
;
Habel, Nolan
[3]
;
James, David J.
[11]
;
Kehoe, Emily
[5]
;
Kuchta, Heidi
[3]
;
Lane, Alexis
[1]
;
Miroshnichenko, Anatoly
[12, 13, 14]
;
Mishra, Ashish
[3]
;
Pablo, Herbert
[15]
;
Peploski, Maurice
[5]
;
Pepper, Joshua
[16]
;
Rodriguez, Joseph E.
[17]
;
Siverd, Robert J.
[18]
;
Stassun, Keivan G.
[19]
;
Stevens, Daniel J.
[20, 21]
;
Trucks, Jesica L.
[22]
;
Windsor, James
[23]
;
Wood, Mackenna
[5]
;
Bertrand, Etienne
[2]
;
Broussat, Jean-Jacques
[2]
;
Bryssinck, Erik
[2]
;
Buil, Christian
[2]
;
Charbonnel, Stephane
[2]
;
de Bruin, Arnold
[2]
;
Daglen, Joe
[2]
;
Desnoux, Valerie
[2]
;
Dull, James
[24]
;
Garde, Olivier
[2]
;
Graham, Keith
[2]
;
Gurney, Kevin
[2]
;
Halsey, Alun
[2]
;
Fosanelli, Patrik
[2]
;
Flo, Joan Guarro
[2]
;
Houpert, Franck
[2]
;
James, Foster
[2]
;
Kreider, Christian
[2]
;
Leadbeater, Robin
[2]
;
Lester, Tim
[2]
;
Li, Dong
[2]
;
Maetz, Alain
[2]
;
Stiewing, Albert
[2]
;
Somogyi, Peter
[2]
;
Terry, Jean-Noel
[2]
;
Ubaud, Stephane
[2]
;
Waldschlaeger, Ulrich
[2]
Total Authors: 61
|
| Affiliation: Show less - | [1] Embry Riddle Aeronaut Univ, Dept Phys & Astron, 3700 Willow Creek Rd, Prescott, AZ 86301 - USA
[2] Astron Ring Access Spect ARAS Grp, Toledo, OH - USA
[3] Univ Toledo, Dept Phys & Astron, Ritter Observ, Toledo, OH 43606 - USA
[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, Sao Paulo - Brazil
[5] Clarkson Univ, Dept Phys, 8 Clarkson Ave, Potsdam, NY 13699 - USA
[6] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 - USA
[7] Georgia State Univ, Ctr High Angular Resolut Astron, POB 5060, Atlanta, GA 30302 - USA
[8] Georgia State Univ, Dept Phys & Astron, POB 5060, Atlanta, GA 30302 - USA
[9] Apache Point Observ, POB 59, Sunspot, NM 88349 - USA
[10] New Mexico State Univ, POB 59, Sunspot, NM 88349 - USA
[11] ASTRAVEO LLC, POB 1668, Gloucester, MA 01931 - USA
[12] Univ North Carolina Greensboro, Dept Phys & Astron, POB 26170, Greensboro, NC 27402 - USA
[13] Russian Acad Sci, Main Astron Observ, Pulkovskoye Shosse 65, St Petersburg 196140 - Russia
[14] Fesenkov Astrophys Inst, Observ 23, Alma Ata 050020 - Kazakhstan
[15] Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 - USA
[16] Lehigh Univ, Dept Phys, 16 Mem Dr East, Bethlehem, PA 18015 - USA
[17] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 - USA
[18] Gemini Observ NSFs, NOIRLab, 670 N A Aohoku Pl, Hilo, HI 96720 - USA
[19] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 - USA
[20] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 - USA
[21] Penn State Univ, Ctr Exoplanets & Habitable Worlds, 525 Davey Lab, University Pk, PA 16802 - USA
[22] Michigan State Univ, Abrams Planetarium, E Lansing, MI 48824 - USA
[23] No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 - USA
[24] Coll Idaho, Caldwell, ID 83605 - USA
Total Affiliations: 24
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 508, n. 2, p. 2002-2018, DEC 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
The bright and understudied classical Be star HD 6226 has exhibited multiple outbursts in the last several years during which the star grew a viscous decretion disc. We analyse 659 optical spectra of the system collected from 2017 to 2020, along with a ultraviolet spectrum from the Hubble Space Telescope and high cadence photometry from both Transiting Exoplanet Survey Satellite (TESS) and the Kilodegree Extremely Little Telescope (KELT) survey. We find that the star has a spectral type of B2.5111e, with a rotation rate of 74 per cent of critical. The star is nearly pole-on with an inclination of 13 degrees 4. We confirm the spectroscopic pulsational properties previously reported, and report on three photometric oscillations from KELT photometry. The outbursting behaviour is studied with equivalent width measurements of H alpha and H beta, and the variations in both of these can be quantitatively explained with two frequencies through a Fourier analysis. One of the frequencies for the emission outbursts is equal to the difference between two photometric oscillations, linking these pulsation modes to the mass ejection mechanism for some outbursts. During the TESS observation time period of 2019 October 7 to 2019 November 2, the star was building a disc. With a large data set of H alpha and H beta spectroscopy, we are able to determine the time-scales of dissipation in both of these lines, similar to past work on Be stars that has been done with optical photometry. HD 6226 is an ideal target with which to study the Be disc-evolution given its apparent periodic nature, allowing for targeted observations with other facilities in the future. (AU) | |
| FAPESP's process: | 18/05326-5 - Bayesian inference of fundamental Be Star parameters by means of spectroscopic observations |
| Grantee: | Matheus Genaro Dantas Xavier |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 18/13285-7 - A truncation model for the Be star alpha col |
| Grantee: | Amanda Caveagna Rubio |
| Support Opportunities: | Scholarships abroad - Research Internship - Master's degree |
| FAPESP's process: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/08001-7 - Searching for invisible binary companions of Be stars |
| Grantee: | Amanda Caveagna Rubio |
| Support Opportunities: | Scholarships in Brazil - Master |