J-PLUS: The fraction of calcium white dwarfs along the cooling sequence

被引：0

作者：

Lopez-Sanjuan, C. ^{[1
]}

Tremblay, P. -E. ^{[2
]}

O'Brien, M. W. ^{[2
]}

Spinoso, D. ^{[3
,4
]}

Ederoclite, A. ^{[1
]}

Ramio, H. Vazquez ^{[1
]}

Cenarro, A. J. ^{[1
]}

Marin-Franch, A. ^{[1
]}

Civera, T. ^{[4
]}

Carrasco, J. M. ^{[5
,6
,7
]}

Gansicke, B. T. ^{[2
]}

Fusillo, N. P. Gentile ^{[8
]}

Hernan-Caballero, A. ^{[1
]}

Hollands, M. A. ^{[9
]}

del Pino, A. ^{[1
]}

Sanchez, H. Dominguez ^{[1
]}

Fernandez-Ontiveros, J. A. ^{[1
]}

Jimenez-Esteban, F. M. ^{[10
]}

Rebassa-Mansergas, A. ^{[7
,11
]}

Schmidtobreick, L. ^{[12
]}

Angulo, R. E. ^{[13
,14
]}

Cristobal-Hornillos, D. ^{[4
]}

Dupke, R. A. ^{[15
,16
,17
]}

Hernandez-Monteagudo, C. ^{[18
,19
]}

Moles, M. ^{[4
]}

Sodre Jr, L. ^{[20
]}

Varela, J. ^{[4
]}

机构：

[1] Unidad Asociada CSIC, Ctr Estudios Fis Cosmos Aragon CEFCA, Plaza San Juan 1, Teruel 44001, Spain

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, England

[3] TNList, 6th Floor,MongManWai Bldg, Beijing 100084, Peoples R China

[4] Ctr Estudios Fis Cosmos Aragon CEFCA, Plaza San Juan 1, Teruel 44001, Spain

[5] Univ Barcelona UB, Inst Ciencies Cosmos ICCUB, Marti I Franques 1, Barcelona 08028, Spain

[6] Univ Barcelona UB, Dept Fis Quant & Astrofis FQA, Marti & Franques 1, E-08028 Barcelona, Spain

[7] UPC, Esteve Terradas 1,Edif RDIT,Campus PMT UPC, Castelldefels 08860, Barcelona, Spain

[8] Univ Trieste, Dept Phys, Via A Valerio 2, I-34127 Trieste, Italy

[9] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, England

[10] CSIC INTA, Ctr Astrobiol CAB, Camino Bajo Castillo S-N, Villanueva De La Canada 28692, Madrid, Spain

[11] Univ Polytecn Catalunya, Dept Fis Enginyeria Nucl, C Esteve Terrades 5, E-08036 Barcelona, Spain

[12] European Southern Observ, Casilla 19001, Santiago, Chile

[13] Donostia Int Phys Ctr DIPC, Paseo Manuel De Lardizabal 4, Donostia San Sebastian 20018, Spain

[14] IKERBASQUE, Basque Fdn Sci, E-48013 Bilbao, Spain

[15] Observ Nacl, Rua Gal Jose Cristino 77, BR-20921400 Sao Cristovao, RJ, Brazil

[16] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

[17] Univ Alabama, Dept Phys & Astron, Gallalee Hall, Tuscaloosa, AL 35401 USA

[18] Inst Astrofis Canarias, San Cristobal la Laguna 38205, Tenerife, Spain

[19] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain

[20] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo, Brazil

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 691卷

基金：

美国国家科学基金会; 欧洲研究理事会; 巴西圣保罗研究基金会;

关键词：

methods: statistical; techniques: photometric; white dwarfs; STANDARD STARS SURVEY; DATA RELEASE; 40; PC; SPECTROSCOPIC ANALYSIS; ACCRETION; CATALOG; CALIBRATION; POPULATION; CANDIDATES; DIFFUSION;

D O I：

10.1051/0004-6361/202451226

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We used the Javalambre Photometric Local Universe Survey (J-PLUS) second data release (DR2) photometry in 12 optical bands over 2176 deg(2) to estimate the fraction of white dwarfs with the presence of Ca II H+K absorption along the cooling sequence. Methods. We compared the J-PLUS photometry against metal-free theoretical models to estimate the equivalent width in the J0395 passband of 10 nm centered at 395 nm (EWJ0395), a proxy to detect calcium absorption. A total of 4399 white dwarfs with effective temperatures within 30 000 > T-eff > 5500 K and masses of M > 0.45 M-circle dot were analyzed. Their EWJ0395 distribution was modeled using two populations, corresponding to polluted and non-polluted systems, to estimate the fraction of calcium white dwarfs (f(Ca)) as a function of Teff. The probability of each individual white dwarf presenting calcium absorption, p(Ca), was also computed. Results. The comparison of EWJ0395 with both the measured Ca/He abundance and the identification of metal pollution from spectroscopy shows that EWJ0395 correlates with the presence of Ca II H+K absorption. The fraction of calcium white dwarfs changes along the cooling sequence, increasing from f(Ca) approximate to 0 at Teff = 13 500 K to f(Ca )approximate to 0.15 at Teff = 5500 K. This trend reflects the selection function of calcium white dwarfs in the optical. We compare our results with the fractions derived from the 40 pc spectroscopic sample and from Sloan Digital Sky Survey (SDSS) spectra. The trend found in J-PLUS observations is also present in the 40 pc sample; however, SDSS shows a deficit of metal-polluted objects at Teff < 12 000 K. Finally, we found 39 white dwarfs with p(Ca) > 0.99. Twenty of them have spectra presented in previous studies, whereas we obtained follow-up spectroscopic observations for six additional targets. These 26 objects were all confirmed as metal-polluted systems. Conclusions. The J-PLUS optical data provide a robust statistical measurement for the presence of Ca II H+K absorption in white dwarfs. We find a 15 +/- 3% increase in the fraction of calcium white dwarfs from T-eff = 13 500 K to 5500 K, which reflects their selection function in the optical from the total population of metal-polluted systems.

引用

页数：16

共 11 条

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López-Sanjuan, C.
Tremblay, P.-E.
O’Brien, M.W.
Spinoso, D.
Ederoclite, A.
Ramió, H. Vázquez
Cenarro, A.J.
Marín-Franch, A.
Civera, T.
Carrasco, J.M.
Gänsicke, B.T.
Fusillo, N.P. Gentile
Hernán-Caballero, A.
Hollands, M.A.
del Pino, A.
Sánchez, H. Domínguez
Fernández-Ontiveros, J.A.
Jiménez-Esteban, F.M.
Rebassa-Mansergas, A.
Schmidtobreick, L.
Angulo, R.E.
Cristóbal-Hornillos, D.
Dupke, R.A.
Hernández-Monteagudo, C.
Moles, M.
Sodré, L.
Varela, J.
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Lopez-Sanjuan, C.
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Angulo, R. E.
Cristobal-Hornillos, D.
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ASTRONOMY & ASTROPHYSICS, 1999, 352 (02) : 632 - 644
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Pier-Emmanuel Tremblay
Gilles Fontaine
Nicola Pietro Gentile Fusillo
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Nature, 2019, 565 : 202 - 205
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NATURE, 2019, 565 (7738) : 202 - 205
[8] J-PLUS: photometric calibration of large-area multi-filter surveys with stellar and white dwarf loci
Lopez-Sanjuan, C.
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ASTRONOMY & ASTROPHYSICS, 2019, 631
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[10] JWST Imaging of the Closest Globular Clusters-V. The White Dwarfs Cooling Sequence of M4
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