<i>HIPPARCOS</i>
                    CALIBRATION OF THE TIP OF THE RED GIANT BRANCH

Tabur, V.; Kiss, L. L.; Bedding, Timothy R.

doi:10.1088/0004-637x/703/1/l72

Cited by 26 publications

(28 citation statements)

References 31 publications

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“…We have based the calibration in K on the sequences measured in the Large Magellanic Cloud by Soszyński et al (2007), taking the distance modulus μ LMC = 18.49 into account (Pietrzyński et al 2013). The variations in the parameter γ allow us to integrate the evolution from the range where OGLE measurements are made, encompassing the tip of the RGB (K magnitude of −6.8 in the solar neighborhood, according to Tabur et al 2009), to the red clump (K magnitude about −1.57, according to van Helshoecht & Groenewegen 2007). Table 5 shows different variables used for the calibration: frequency ν max , effective temperature, and parameters used for integrating Eq.…”

Section: New Calibrationmentioning

confidence: 99%

Period-luminosity relations in evolved red giants explained by solar-like oscillations

Mosser

Dziembowski

Belkacem

et al. 2013

A&A

114

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Context. Solar-like oscillations in red giants have been investigated with the space-borne missions CoRoT and Kepler, while pulsations in more evolved M giants have been studied with ground-based microlensing surveys. After 3.1 years of observation with Kepler, it is now possible to link these different observations of semi-regular variables. Aims. We aim to identify period-luminosity sequences in evolved red giants identified as semi-regular variables and to interpret them in terms of solar-like oscillations. Then, we investigate the consequences of the comparison of ground-based and space-borne observations. Methods. We first measured global oscillation parameters of evolved red giants observed with Kepler with the envelope autocorrelation function method. We then used an extended form of the universal red giant oscillation pattern, extrapolated to very low frequency, to fully identify their oscillations. The comparison with ground-based results was then used to express the period-luminosity relation as a relation between the large frequency separation and the stellar luminosity. Results. From the link between red giant oscillations observed by Kepler and period-luminosity sequences, we have identified these relations in evolved red giants as radial and non-radial solar-like oscillations. We were able to expand scaling relations at very low frequency (periods as long as 100 days and large frequency separation less than 0.05 μHz). This helped us identify the different sequences of period-luminosity relations, and allowed us to propose a calibration of the K magnitude with the observed large frequency separation. Conclusions. Interpreting period-luminosity relations in red giants in terms of solar-like oscillations allows us to investigate the time series obtained from ground-based microlensing surveys with a firm physical basis. This can be done with an analytical expression that describes the low-frequency oscillation spectra. The different behavior of oscillations at low frequency, with frequency separations scaling only approximately with the square root of the mean stellar density, can be used to precisely address the physics of the semi-regular variables. This will allow improved distance measurements and opens the way to extragalactic asteroseismology with the observations of M giants in the Magellanic Clouds.

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Section: New Calibrationmentioning

confidence: 99%

Period-luminosity relations in evolved red giants explained by solar-like oscillations

Mosser

Dziembowski

Belkacem

et al. 2013

A&A

114

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“…In the following the edge-detection method is explained briefly only, but for further details see Lee et al (1993), Sakai et al (1996), Tabur et al (2009), and references therein.…”

Section: Turn-off Detection: Sobel Kernel Edge-detectionmentioning

confidence: 99%

The age of the Milky Way halo stars from the Sloan Digital Sky Survey

Jofré

Weiß

2011

A&A

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We determined the age of the stellar content of the Galactic halo by considering main-sequence turn-off stars. From the large number of halo stars provided by Sloan Digital Sky Survey, we could accurately detect the turn-off as a function of metallicity of the youngest dominant population, which was done by looking at the hottest (bluest) stars of a population. Using the turn-off temperature of a population of a given metallicity, we looked for the isochrones with that turn-off temperature and metallicity and found no age gradient as a function of metallicity. This would mean that this dominating population of the Galactic halo formed rapidly, probably during the collapse of the proto-Galactic gas. Moreover, we could find a significant number of stars with hotter temperatures than the turn-off, which might be blue horizontal branch (BHB) stars, blue stragglers, or main sequence stars that are younger than the dominant population and were probably formed in external galaxies and accreted later on to our Milky Way. Motivated by the current debate about the efficiency of gravitational settling (atomic diffusion) in the interior of old solar-type stars, we used isochrones with and without settling to determine the ages. When ignoring diffusion in the isochrones we obtained ages of 14−16 Gyr. This result is a strong argument against inhibited diffusion in old halo field stars, since it results in a serious conflict with the age of the Universe of 13.7 Gyr. The age obtained including diffusion in the isochrones was 10−12 Gyr, which agrees with the absolute age of the old globular clusters in the inner halo.

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“…Ultimately, if we wish to calibrate the TRGB directly to better than 1 per cent, we must construct a distance ladder that relies only on the TRGB technique from our local environment direct to the SNe Ia calibrators. Tabur et al (2009) have combined Hipparcos (Perryman et al 1997) and photometry from the 2-Micron All Sky Survey (2MASS Skrutskie et al 2006) to calibrate the magnitude of the TRGB in the NIR (K s ). An optical all-sky catalog with comparable photometric precision does not yet exist.…”

Section: Gaia Parallaxes For Rr Lyrae Variablesmentioning

confidence: 99%

“…An optical all-sky catalog with comparable photometric precision does not yet exist. Following the example of Tabur et al (2009), we are producing high quality optical photometry for as many tip stars as are accessible from Las Campanas Observatory. More than 1000 of the Tabur et al (2009) tip stars (determined from Hipparcos) are accessible by the TMMT and we are pursuing B,V ,I photometry for these stars (with multiple epochs to test for variable AGB contaminants at the tip).…”

Section: Gaia Parallaxes For Rr Lyrae Variablesmentioning

confidence: 99%

The Carnegie-Chicago Hubble Program. I. An Independent Approach to the Extragalactic Distance Scale Using Only Population Ii Distance Indicators*

Beaton

Freedman

Madore

et al. 2016

ApJ

142

117

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We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3 per cent measurement of the Hubble constant (H 0 ) using alternative methods to the traditional Cepheid distance scale. We aim to establish a completely independent route to H 0 using RR Lyrae variables, the tip of the red giant branch (TRGB), and Type Ia supernovae (SNe Ia). This alternative distance ladder can be applied to galaxies of any Hubble Type, of any inclination, and, utilizing old stars in low density environments, is robust to the degenerate effects of metallicity and interstellar extinction. Given the relatively small number of SNe Ia host galaxies with independently measured distances, these properties provide a great systematic advantage in the measurement of H 0 via the distance ladder. Initially, the accuracy of our value of H 0 will be set by the five Galactic RR Lyrae calibrators with Hubble Space Telescope Fine-Guidance Sensor parallaxes. With Gaia, both the RR Lyrae zero point and TRGB method will be independently calibrated, the former with at least an order of magnitude more calibrators and the latter directly through parallax measurement of tip red giants. As the first end-to-end "distance ladder" completely independent of both Cepheid variables and the Large Magellanic Cloud, this path to H 0 will allow for the high precision comparison at each rung of the traditional distance ladder that is necessary to understand tensions between this and other routes to H 0 .

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HIPPARCOS CALIBRATION OF THE TIP OF THE RED GIANT BRANCH

Cited by 26 publications

References 31 publications

Period-luminosity relations in evolved red giants explained by solar-like oscillations

Period-luminosity relations in evolved red giants explained by solar-like oscillations

The age of the Milky Way halo stars from the Sloan Digital Sky Survey

The Carnegie-Chicago Hubble Program. I. An Independent Approach to the Extragalactic Distance Scale Using Only Population Ii Distance Indicators*

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