Better distances to open clusters through calibrated isochrones

D. An; D. M. Terndrup; M. H. Pinsonneault

Better distances to open clusters through calibrated isochrones

D. An, D. M. Terndrup, M. H. Pinsonneault

Department of Science Education

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present a progress report on our efforts to improve the calibration of theoretical isochrones using nearby stars and clusters with accurate parallaxes. Previously, we confirmed that several widely-used color-temperature relations have significant systematic errors, and proposed an adjusted color-temperature relation in BVI_cK_s based on the Hyades. Here, we show that these calibrated isochrones give internally consistent distances to nearby open clusters at the metal abundances indicated from high-resolution spectra. Finally, we present new time-series photometry of spotted variable stars to explore the causes of the significant departures from the isochrone lower main-sequence seen in the photometry of young open clusters.

Original language	English
Pages (from-to)	395-398
Number of pages	4
Journal	European Space Agency, (Special Publication) ESA SP
Issue number	560 I
State	Published - 2005
Event	13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany Duration: 5 Jul 2004 → 9 Jul 2004

Keywords

Hertzsprung-Russell (HR) and C-M diagrams
Open clusters and associations: individual: Hyades, Praesepe, Pleiades
Stars: abundances
Stars: activity
Stars: distances
Stars: evolution

Cite this

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title = "Better distances to open clusters through calibrated isochrones",

abstract = "We present a progress report on our efforts to improve the calibration of theoretical isochrones using nearby stars and clusters with accurate parallaxes. Previously, we confirmed that several widely-used color-temperature relations have significant systematic errors, and proposed an adjusted color-temperature relation in BVIcKs based on the Hyades. Here, we show that these calibrated isochrones give internally consistent distances to nearby open clusters at the metal abundances indicated from high-resolution spectra. Finally, we present new time-series photometry of spotted variable stars to explore the causes of the significant departures from the isochrone lower main-sequence seen in the photometry of young open clusters.",

keywords = "Hertzsprung-Russell (HR) and C-M diagrams, Open clusters and associations: individual: Hyades, Praesepe, Pleiades, Stars: abundances, Stars: activity, Stars: distances, Stars: evolution",

author = "D. An and Terndrup, {D. M.} and Pinsonneault, {M. H.}",

year = "2005",

language = "English",

pages = "395--398",

journal = "European Space Agency, (Special Publication) ESA SP",

issn = "0379-6566",

publisher = "European Space Agency",

number = "560 I",

note = "13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun ; Conference date: 05-07-2004 Through 09-07-2004",

}

TY - JOUR

T1 - Better distances to open clusters through calibrated isochrones

AU - An, D.

AU - Terndrup, D. M.

AU - Pinsonneault, M. H.

PY - 2005

Y1 - 2005

N2 - We present a progress report on our efforts to improve the calibration of theoretical isochrones using nearby stars and clusters with accurate parallaxes. Previously, we confirmed that several widely-used color-temperature relations have significant systematic errors, and proposed an adjusted color-temperature relation in BVIcKs based on the Hyades. Here, we show that these calibrated isochrones give internally consistent distances to nearby open clusters at the metal abundances indicated from high-resolution spectra. Finally, we present new time-series photometry of spotted variable stars to explore the causes of the significant departures from the isochrone lower main-sequence seen in the photometry of young open clusters.

AB - We present a progress report on our efforts to improve the calibration of theoretical isochrones using nearby stars and clusters with accurate parallaxes. Previously, we confirmed that several widely-used color-temperature relations have significant systematic errors, and proposed an adjusted color-temperature relation in BVIcKs based on the Hyades. Here, we show that these calibrated isochrones give internally consistent distances to nearby open clusters at the metal abundances indicated from high-resolution spectra. Finally, we present new time-series photometry of spotted variable stars to explore the causes of the significant departures from the isochrone lower main-sequence seen in the photometry of young open clusters.

KW - Hertzsprung-Russell (HR) and C-M diagrams

KW - Open clusters and associations: individual: Hyades, Praesepe, Pleiades

KW - Stars: abundances

KW - Stars: activity

KW - Stars: distances

KW - Stars: evolution

UR - http://www.scopus.com/inward/record.url?scp=23844495482&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:23844495482

SN - 0379-6566

SP - 395

EP - 398

JO - European Space Agency, (Special Publication) ESA SP

JF - European Space Agency, (Special Publication) ESA SP

IS - 560 I

T2 - 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun

Y2 - 5 July 2004 through 9 July 2004

ER -

Better distances to open clusters through calibrated isochrones

Abstract

Keywords

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