Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids

  title={Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids},
  author={P'eter Klagyivik and L{\'a}szl{\'o} Szabados},
  journal={Astronomy and Astrophysics},
Context. The dependence of amplitude on the pulsation period differs from other Cepheid-related relationships. Aims. We attempt to revise the period-amplitude (P-A) relationship of Galactic Cepheids based on multi-colour photometric and radial velocity data. Reliable P-A graphs for Galactic Cepheids constructed for the U, B, V, RC ,a ndIC photometric bands and pulsational radial velocity variations facilitate investigations of previously poorly studied interrelations between observable… 

Observational studies of Cepheid amplitudes - II. Metallicity dependence of pulsation amplitudes

Context. Physical and phenomenological properties (radius, luminosity, shape of the light curve, etc.) of Cepheids strongly depend on the pulsation period, with the exception of the pulsation

Calibrating the projection factor for Galactic Cepheids

Context. The projection factor (p), which converts the radial velocity to pulsational velocity, is an important parameter in the Baade-Wesselink (BW) type analysis and distance scale work. The

Discovery of the spectroscopic binary nature of six southern Cepheids

We present the analysis of photometric and spectroscopic data of six bright Galactic Cepheids: GH Carinae, V419 Centauri, V898 Centauri, AD Puppis, AY Sagittarii and ST Velorum. Based on new radial


We perform a global fit to ∼5000 radial velocity and ∼177, 000 magnitude measurements in 29 photometric bands covering 0.3 μm to 8.0 μm distributed among 287 Galactic, Large Magellanic Cloud, and

Discovery of the spectroscopic binary nature of three bright southern Cepheids

We present an analysis of spectroscopic radial velocity and photometric data of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum (RZ Vel), and BG Velorum (BG Vel). Based on

Probing Polaris’ puzzling radial velocity signals

  • R. Anderson
  • Physics, Geology
    Astronomy & Astrophysics
  • 2019
We investigate temporally changing variability amplitudes and the multi-periodicity of the type-I Cepheid Polaris using 161 high-precision radial velocity (RV) and bisector inverse span (BIS)

The Cepheid period–luminosity–metallicity relation based on Gaia DR2 data

Aims. We use parallax data from the Gaia second data release (GDR2), combined with parallax data based on HIPPARCOS and HST data, to derive the period–luminosity–metallicity (PLZ) relation for

Determination of the iron content of Cepheids from the shape of their light curves

We present the study of the metallicity dependence of the Fourier amplitude ratios R_21 and R_31 for the light curves of short-period Galactic classical Cepheids in B, V, R_C and I_C bands. Based on

V473 Lyrae, a unique second-overtone Cepheid with two modulation cycles

V473 Lyrae is the only Galactic Cepheid with confirmed periodic amplitude and phase variations similar to the Blazhko effect observed in RR Lyrae stars. We collected all available photometric data

Period and light‐curve fluctuations of the Kepler Cepheid V1154 Cygni

We present a detailed period analysis of the bright Cepheid-type variable star V1154 Cygni (V1154 Cyg; V = 9.1 mag, P ≈ 4.9 d) based on almost 600 d of continuous observations by the Kepler space



Baade-Wesselink distances and the effect of metallicity in classical cepheids

Context. The metallicity dependence of the Cepheid PL-relation is of importance in establishing the extra-galactic distance scale. Aims. The aim of this paper is to investigate the metallicity

New period-luminosity and period-color relations of classical Cepheids. II. Cepheids in LMC

Photometric data for 593 Cepheids in the LMC, measured by Udalski et al. in the OGLE survey, augmented by 97 longer period Cepheids from other sources, are analyzed for the period-color (P-C) and

Period–colour and amplitude–colour relations in classical Cepheid variables – IV. The multiphase relations

The superb phase resolution and quality of the Optical Gravitational Lensing Experiment (OGLE) data on the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) Cepheids, together with

A survey of Bump Cepheid model pulsations

The periodical nonlinear behavior of a number of sequences of radiative Cepheid models is computed and Fourier analyzed. The Fourier phases and amplitudes exhibit systematic and characteristic

The Structural Properties Of Cepheid Light Curves

Fourier decompositions are performed for the V magnitude variations of a sample of 57 Cepheids ranging in period from 2 to 17 days. The coefficients have been tabulated to allow rapid reconstruction

The Cepheid Phase Lag Revisited

We compute the phase lags between the radial velocity curves and the light curves ΔΦ1 = ϕ - ϕ for classical Cepheid model sequences both in the linear and the nonlinear regimes. The nonlinear phase

A spectroscopic study of bright southern Cepheids - a high-resolution view of Cepheid atmospheres

We present high-resolution spectroscopic observations and species-by-species radial velocities of a number of southern Cepheids. The stars (BP Cir, V350 Sgr, AX Cir, V636 Sco, W Sgr, S Mus, β Dor, TT

A photometric and spectroscopic study of the brightest northern Cepheids — I. Observations

We present simultaneous UBVuvby photometry for the 18 brightest northern Cepheids carried out between 1995 and 1997. Additionally, two fainter stars have been observed in the Johnson system only. The

Period-colour and amplitude-colour relations in classical Cepheid variables - III. The Large Magellanic Cloud Cepheid models: Cepheid PC & AC relations - III

Period-colour (PC) and amplitude-colour (AC) relations are studied for the Large Magellanic Cloud (LMC) Cepheids under the theoretical framework of the hydrogen ionization front (HIF) - photosphere

Frequency analysis of Cepheids in the Large Magellanic Cloud: new types of classical Cepheid pulsators

We have performed a detailed systematic search for multiperiodicity in the Population I Cepheids of the Large Magellanic Cloud. In this process, we have identified for the first time several new