TESS cycle 1 observations of roAp stars with 2-min cadence data

Holdsworth, D.; Cunha, M.; Kurtz, D.; Antoci, V; Hey, D.; Bowman, D.; Kobzar, O.; Buzasi, D.; Kochukhov, O.; Niemczura, E.; ÖZUYAR, DOĞUŞ; Shi, F.; Szabo, R.; Samadi-Ghadim, A.; Bognar, Zs; Fox-Machado, L.; Khalack, V; Lares-Martiz, M.; Lovekin, C.; Mikolajczyk, P.; Mkrtichian, D.; Pascual-Granado, J.; Paunzen, E.; Richey-Yowell, T.; Sodor, A.; Sikora, J.; Yang, T.; Brunsden, E.; David-Uraz, A.; Derekas, A.; Garcia Hernandez, A.; Guzik, J.; Hatamkhani, N.; Handberg, R.; Lambert, T.; Lampens, P.; Murphy, S.; Monier, R.; Pollard, K.; Quitral-Manosalva, P.; Ramon-Ballesta, A.; Smalley, B.; Stateva, I; Vanderspek, R.

doi:10.1093/mnras/stab1578

TESS cycle 1 observations of roAp stars with 2-min cadence data

Atıf İçin Kopyala

Holdsworth D. L., Cunha M. S., Kurtz D. W., Antoci V., Hey D. R., Bowman D. M., ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.506, sa.1, ss.1073-1110, 2021 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 506 Sayı: 1
Basım Tarihi: 2021
Doi Numarası: 10.1093/mnras/stab1578
Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
Sayfa Sayıları: ss.1073-1110
Anahtar Kelimeler: asteroseismology, techniques: photometric, stars: chemically peculiar, stars: magnetic field, stars: oscillations, stars: variables, OSCILLATING AP-STAR, RADIAL-VELOCITY VARIATIONS, MEAN LIGHT VARIATIONS, MAGNETIC-FIELD MEASUREMENTS, LINE-PROFILE VARIATIONS, OBLIQUE PULSATOR MODEL, VOLUME-LIMITED SURVEY, CHEMICALLY PECULIAR, ROTATIONAL PERIODS, FREQUENCY-ANALYSIS
Ankara Üniversitesi Adresli: Evet

Özet

We present the results of a systematic search for new rapidly oscillating Ap (roAp) stars using the 2-min cadence data collected by the Transiting Exoplanet Survey Satellite (TESS) during its Cycle 1 observations. We identify 12 new roAp stars. Amongst these stars we discover the roAp star with the longest pulsation period, another with the shortest rotation period, and six with multiperiodic variability. In addition to these new roAp stars, we present an analysis of 44 known roAp stars observed by TESS during Cycle 1, providing the first high-precision and homogeneous sample of a significant fraction of the known roAp stars. The TESS observations have shown that almost 60 percent (33) of our sample of stars are multiperiodic, providing excellent cases to test models of roAp pulsations, and from which the most rewarding asteroseismic results can be gleaned. We report four cases of the occurrence of rotationally split frequency multiplets that imply different mode geometries for the same degree modes in the same star. This provides a conundrum in applying the oblique pulsator model to the roAp stars. Finally, we report the discovery of non-linear mode interactions in alpha Cir (TIC402546736, HD128898) around the harmonic of the principal mode - this is only the second case of such a phenomenon.