Abstract
This chapter begins with a discussion of the basic methods of determining astronomical distances, particularly, trigonometrical, statistical, and pulsational parallaxes. It then summarizes the current state of the calibration of various classes of pulsating variables (Classical Cepheids, type-II Cepheids, RR Lyraes, Miras, and δ Sct and SX Phe stars). Work on other distance indicators (e.g., the red giant clump and the tip of the red giant branch) is also summarized. The use of spectroscopic parallaxes and their application to supergiants and common stars as well as the methods of determining the distances to open and globular clusters are discussed. To illustrate and compare different distance indicators, their use in estimating the scale length of our Galaxy, and the distance to Galactic centre as well as the distances to the LMC, the Fornax dwarf spheroidal, and the spiral galaxy NGC4258 is discussed in some detail. An appendix summarizes some common bias problems that arise in the calibration and use of distance indicators.
Notes
- 1.
Miyamota and Zhu (1998) obtained somewhat larger values of A from Hipparcos proper motions of both OB stars and Cepheids. This may be at least partly due to the fact that the velocity dispersions of the stars do not seem to have been taken into account in their weighting procedure.
- 2.
The procedure followed by the Sandage group (e.g., Saha et al. 2006) is to use observed PL relations at V and I separately and to combine them to obtain reddening-free distance moduli. This is obviously equivalent in principle to using a relation in W VI .
- 3.
In the case of near-infrared photometry, there are appreciable differences between different filter systems (see, e.g., Carpenter 2001).
- 4.
This is in the “T e ” abundance system. In application, it is essential to ensure that adopted metallicities are as close to this system as possible.
- 5.
The photometry is in the system of the IRSF survey (Kato et al. 2007) which is close to the 2MASS system.
- 6.
Anomalous Cepheids which lie between the Classical and type II Cepheids in PL diagrams have not, so far, been studied in detail as possible distance indicators.
- 7.
The value of α obtained in a consistent manner from pulsation parallaxes may well be satisfactory, though the derived absolute magnitudes may be affected by systematic errors (see below).
- 8.
Benedict et al. also give an alternative solution involving the application of a Lutz-Kelker bias correction (see Sect. A.4).
- 9.
Full light curves of Miras at wavelengths longer than ∼ 3. 5 μm are rare, and bolometric magnitudes are often derived using bolometric corrections to K, based on colors. Such magnitudes may contain systematic errors but are valuable as distance indicators so long as they are derived consistently.
- 10.
According to Riess et al. (2009), unpublished data reduce this standard error to ∼ 0. 07.
- 11.
Feast and Catchpole (1997) obtained 18. 70 ± 0. 10 for the LMC modulus from the initial release of Hipparcos parallaxes and B, V data of Galactic and LMC Cepheids. The difference from the present value is primarily due to the improvement in LMC data (mainly due to OGLE) and the possibility of using V, I photometry. The new trigonometrical parallaxes, although more accurate than those used in 1997, are not systematically different.
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Feast, M.W. (2013). Galactic Distance Scales. In: Oswalt, T.D., Gilmore, G. (eds) Planets, Stars and Stellar Systems. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5612-0_16
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